Bisphenol A and the risk of cardiometabolic disorders: a systematic review with meta-analysis of the epidemiological evidence
Identifieur interne : 000B81 ( Pmc/Corpus ); précédent : 000B80; suivant : 000B82Bisphenol A and the risk of cardiometabolic disorders: a systematic review with meta-analysis of the epidemiological evidence
Auteurs : Fanny Rancière ; Jasmine G. Lyons ; Venurs H. Y. Loh ; Jérémie Botton ; Tamara Galloway ; Tiange Wang ; Jonathan E. Shaw ; Dianna J. MaglianoSource :
- Environmental Health [ 1476-069X ] ; 2015.
Abstract
Bisphenol A (BPA) is suspected to be associated with several chronic metabolic diseases. The aim of the present study was to review the epidemiological literature on the relation between BPA exposure and the risk of cardiometabolic disorders. PubMed and Embase databases were searched up to August 2014 by two independent investigators using standardized subject terms. We included observational studies (cohort, case–control and cross-sectional studies) carried out in children or adults, measuring urinary BPA (uBPA), including at least 100 participants and published in English. The health outcomes of interest were diabetes, hyperglycemia, measures of anthropometry, cardiovascular disease (CVD) and hypertension. Data were extracted and meta-analyzed when feasible, using a random-effects model. Thirty-three studies with sample size ranging from 239 to 4811 met the inclusion criteria, including five with a prospective design. Twelve studies reported on diabetes or hyperglycemia, 16 on anthropometry, 6 on CVD and 3 on hypertension. Evidence for a positive association between uBPA concentrations and diabetes, overweight, obesity, elevated waist circumference (WC), CVD and hypertension was found in 7/8, 2/7, 6/7, 5/5, 4/5 and 2/3 of the cross-sectional studies, respectively. We were able to conduct outcome-specific meta-analyses including 12 studies. When comparing the highest vs. the lowest uBPA concentrations, the pooled ORs were 1.47 (95 % CI: 1.21–1.80) for diabetes, 1.21 (95 % CI: 0.98–1.50) for overweight, 1.67 (95 % CI: 1.41–1.98) for obesity, 1.48 (95 % CI: 1.25–1.76) for elevated WC, and 1.41 (95 % CI: 1.12–1.79) for hypertension. Moreover, among the five prospective studies, 3 reported significant findings, relating BPA exposure to incident diabetes, incident coronary artery disease, and weight gain. To conclude, there is evidence from the large body of cross-sectional studies that individuals with higher uBPA concentrations are more likely to suffer from diabetes, general/abdominal obesity and hypertension than those with lower uBPA concentrations. Given the potential importance for public health, prospective cohort studies with proper adjustment for dietary characteristics and identification of critical windows of exposure are urgently needed to further improve knowledge about potential causal links between BPA exposure and the development of chronic disease.
The online version of this article (doi:10.1186/s12940-015-0036-5) contains supplementary material, which is available to authorized users.
Url:
DOI: 10.1186/s12940-015-0036-5
PubMed: 26026606
PubMed Central: 4472611
Links to Exploration step
PMC:4472611Le document en format XML
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<front><div type="abstract" xml:lang="en"><p>Bisphenol A (BPA) is suspected to be associated with several chronic metabolic diseases. The aim of the present study was to review the epidemiological literature on the relation between BPA exposure and the risk of cardiometabolic disorders. PubMed and Embase databases were searched up to August 2014 by two independent investigators using standardized subject terms. We included observational studies (cohort, case–control and cross-sectional studies) carried out in children or adults, measuring urinary BPA (uBPA), including at least 100 participants and published in English. The health outcomes of interest were diabetes, hyperglycemia, measures of anthropometry, cardiovascular disease (CVD) and hypertension. Data were extracted and meta-analyzed when feasible, using a random-effects model. Thirty-three studies with sample size ranging from 239 to 4811 met the inclusion criteria, including five with a prospective design. Twelve studies reported on diabetes or hyperglycemia, 16 on anthropometry, 6 on CVD and 3 on hypertension. Evidence for a positive association between uBPA concentrations and diabetes, overweight, obesity, elevated waist circumference (WC), CVD and hypertension was found in 7/8, 2/7, 6/7, 5/5, 4/5 and 2/3 of the cross-sectional studies, respectively. We were able to conduct outcome-specific meta-analyses including 12 studies. When comparing the highest vs. the lowest uBPA concentrations, the pooled ORs were 1.47 (95 % CI: 1.21–1.80) for diabetes, 1.21 (95 % CI: 0.98–1.50) for overweight, 1.67 (95 % CI: 1.41–1.98) for obesity, 1.48 (95 % CI: 1.25–1.76) for elevated WC, and 1.41 (95 % CI: 1.12–1.79) for hypertension. Moreover, among the five prospective studies, 3 reported significant findings, relating BPA exposure to incident diabetes, incident coronary artery disease, and weight gain. To conclude, there is evidence from the large body of cross-sectional studies that individuals with higher uBPA concentrations are more likely to suffer from diabetes, general/abdominal obesity and hypertension than those with lower uBPA concentrations. Given the potential importance for public health, prospective cohort studies with proper adjustment for dietary characteristics and identification of critical windows of exposure are urgently needed to further improve knowledge about potential causal links between BPA exposure and the development of chronic disease.</p>
<sec><title>Electronic supplementary material</title>
<p>The online version of this article (doi:10.1186/s12940-015-0036-5) contains supplementary material, which is available to authorized users.</p>
</sec>
</div>
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<author><name sortKey="Connolly, P" uniqKey="Connolly P">P Connolly</name>
</author>
<author><name sortKey="Chuang, Jc" uniqKey="Chuang J">JC Chuang</name>
</author>
</analytic>
</biblStruct>
<biblStruct><analytic><author><name sortKey="Vandentorren, S" uniqKey="Vandentorren S">S Vandentorren</name>
</author>
<author><name sortKey="Zeman, F" uniqKey="Zeman F">F Zeman</name>
</author>
<author><name sortKey="Morin, L" uniqKey="Morin L">L Morin</name>
</author>
<author><name sortKey="Sarter, H" uniqKey="Sarter H">H Sarter</name>
</author>
<author><name sortKey="Bidondo, Ml" uniqKey="Bidondo M">ML Bidondo</name>
</author>
<author><name sortKey="Oleko, A" uniqKey="Oleko A">A Oleko</name>
</author>
</analytic>
</biblStruct>
<biblStruct><analytic><author><name sortKey="Udovyk, O" uniqKey="Udovyk O">O Udovyk</name>
</author>
</analytic>
</biblStruct>
<biblStruct></biblStruct>
</listBibl>
</div1>
</back>
</TEI>
<pmc article-type="research-article"><pmc-dir>properties open_access</pmc-dir>
<front><journal-meta><journal-id journal-id-type="nlm-ta">Environ Health</journal-id>
<journal-id journal-id-type="iso-abbrev">Environ Health</journal-id>
<journal-title-group><journal-title>Environmental Health</journal-title>
</journal-title-group>
<issn pub-type="epub">1476-069X</issn>
<publisher><publisher-name>BioMed Central</publisher-name>
<publisher-loc>London</publisher-loc>
</publisher>
</journal-meta>
<article-meta><article-id pub-id-type="pmid">26026606</article-id>
<article-id pub-id-type="pmc">4472611</article-id>
<article-id pub-id-type="publisher-id">36</article-id>
<article-id pub-id-type="doi">10.1186/s12940-015-0036-5</article-id>
<article-categories><subj-group subj-group-type="heading"><subject>Review</subject>
</subj-group>
</article-categories>
<title-group><article-title>Bisphenol A and the risk of cardiometabolic disorders: a systematic review with meta-analysis of the epidemiological evidence</article-title>
</title-group>
<contrib-group><contrib contrib-type="author" equal-contrib="yes"><name><surname>Rancière</surname>
<given-names>Fanny</given-names>
</name>
<address><email>fanny.ranciere@inserm.fr</email>
</address>
<xref ref-type="aff" rid="Aff1"></xref>
<xref ref-type="aff" rid="Aff2"></xref>
<xref ref-type="aff" rid="Aff3"></xref>
</contrib>
<contrib contrib-type="author" equal-contrib="yes"><name><surname>Lyons</surname>
<given-names>Jasmine G.</given-names>
</name>
<address><email>jasmine.lyons@bakeridi.edu.au</email>
</address>
<xref ref-type="aff" rid="Aff3"></xref>
</contrib>
<contrib contrib-type="author"><name><surname>Loh</surname>
<given-names>Venurs H.Y.</given-names>
</name>
<address><email>venurs.loh@bakeridi.edu.au</email>
</address>
<xref ref-type="aff" rid="Aff3"></xref>
</contrib>
<contrib contrib-type="author"><name><surname>Botton</surname>
<given-names>Jérémie</given-names>
</name>
<address><email>jeremie.botton@inserm.fr</email>
</address>
<xref ref-type="aff" rid="Aff1"></xref>
<xref ref-type="aff" rid="Aff2"></xref>
<xref ref-type="aff" rid="Aff4"></xref>
</contrib>
<contrib contrib-type="author"><name><surname>Galloway</surname>
<given-names>Tamara</given-names>
</name>
<address><email>t.s.galloway@exeter.ac.uk</email>
</address>
<xref ref-type="aff" rid="Aff5"></xref>
</contrib>
<contrib contrib-type="author"><name><surname>Wang</surname>
<given-names>Tiange</given-names>
</name>
<address><email>wtg@live.cn</email>
</address>
<xref ref-type="aff" rid="Aff6"></xref>
</contrib>
<contrib contrib-type="author"><name><surname>Shaw</surname>
<given-names>Jonathan E.</given-names>
</name>
<address><email>jonathan.shaw@bakeridi.edu.au</email>
</address>
<xref ref-type="aff" rid="Aff3"></xref>
</contrib>
<contrib contrib-type="author" corresp="yes"><name><surname>Magliano</surname>
<given-names>Dianna J.</given-names>
</name>
<address><phone>+61 3 8532 1826</phone>
<email>dianna.magliano@bakeridi.edu.au</email>
</address>
<xref ref-type="aff" rid="Aff3"></xref>
</contrib>
<aff id="Aff1"><label></label>
Inserm, U1153, Epidemiology and Biostatistics Sorbonne Paris Cité Research Centre (CRESS), Early Origin of the Child’s Health and Development (ORCHAD) Team, Villejuif, France</aff>
<aff id="Aff2"><label></label>
Univ Paris Descartes, UMR1153, Paris, France</aff>
<aff id="Aff3"><label></label>
Department of Clinical Diabetes and Epidemiology, Baker IDI Heart and Diabetes Institute, Level 4, 99 Commercial Road, Melbourne, VIC 3000 Australia</aff>
<aff id="Aff4"><label></label>
Faculty of Pharmacy, Univ Paris-Sud, Châtenay-Malabry, France</aff>
<aff id="Aff5"><label></label>
Department of Biosciences, University of Exeter, College of Life and Environmental Sciences, Exeter, UK</aff>
<aff id="Aff6"><label></label>
Shanghai Clinical Center for Endocrine and Metabolic Diseases, Rui Jin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China</aff>
</contrib-group>
<pub-date pub-type="epub"><day>31</day>
<month>5</month>
<year>2015</year>
</pub-date>
<pub-date pub-type="pmc-release"><day>31</day>
<month>5</month>
<year>2015</year>
</pub-date>
<pub-date pub-type="collection"><year>2015</year>
</pub-date>
<volume>14</volume>
<elocation-id>46</elocation-id>
<history><date date-type="received"><day>5</day>
<month>1</month>
<year>2015</year>
</date>
<date date-type="accepted"><day>25</day>
<month>5</month>
<year>2015</year>
</date>
</history>
<permissions><copyright-statement>© Rancière et al. 2015</copyright-statement>
<license license-type="open-access"><license-p>This is an Open Access article distributed under the terms of the Creative Commons Attribution License (<ext-link ext-link-type="uri" xlink:href="http://creativecommons.org/licenses/by/4.0">http://creativecommons.org/licenses/by/4.0</ext-link>
), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. The Creative Commons Public Domain Dedication waiver (<ext-link ext-link-type="uri" xlink:href="http://creativecommons.org/publicdomain/zero/1.0/">http://creativecommons.org/publicdomain/zero/1.0/</ext-link>
) applies to the data made available in this article, unless otherwise stated.</license-p>
</license>
</permissions>
<abstract id="Abs1"><p>Bisphenol A (BPA) is suspected to be associated with several chronic metabolic diseases. The aim of the present study was to review the epidemiological literature on the relation between BPA exposure and the risk of cardiometabolic disorders. PubMed and Embase databases were searched up to August 2014 by two independent investigators using standardized subject terms. We included observational studies (cohort, case–control and cross-sectional studies) carried out in children or adults, measuring urinary BPA (uBPA), including at least 100 participants and published in English. The health outcomes of interest were diabetes, hyperglycemia, measures of anthropometry, cardiovascular disease (CVD) and hypertension. Data were extracted and meta-analyzed when feasible, using a random-effects model. Thirty-three studies with sample size ranging from 239 to 4811 met the inclusion criteria, including five with a prospective design. Twelve studies reported on diabetes or hyperglycemia, 16 on anthropometry, 6 on CVD and 3 on hypertension. Evidence for a positive association between uBPA concentrations and diabetes, overweight, obesity, elevated waist circumference (WC), CVD and hypertension was found in 7/8, 2/7, 6/7, 5/5, 4/5 and 2/3 of the cross-sectional studies, respectively. We were able to conduct outcome-specific meta-analyses including 12 studies. When comparing the highest vs. the lowest uBPA concentrations, the pooled ORs were 1.47 (95 % CI: 1.21–1.80) for diabetes, 1.21 (95 % CI: 0.98–1.50) for overweight, 1.67 (95 % CI: 1.41–1.98) for obesity, 1.48 (95 % CI: 1.25–1.76) for elevated WC, and 1.41 (95 % CI: 1.12–1.79) for hypertension. Moreover, among the five prospective studies, 3 reported significant findings, relating BPA exposure to incident diabetes, incident coronary artery disease, and weight gain. To conclude, there is evidence from the large body of cross-sectional studies that individuals with higher uBPA concentrations are more likely to suffer from diabetes, general/abdominal obesity and hypertension than those with lower uBPA concentrations. Given the potential importance for public health, prospective cohort studies with proper adjustment for dietary characteristics and identification of critical windows of exposure are urgently needed to further improve knowledge about potential causal links between BPA exposure and the development of chronic disease.</p>
<sec><title>Electronic supplementary material</title>
<p>The online version of this article (doi:10.1186/s12940-015-0036-5) contains supplementary material, which is available to authorized users.</p>
</sec>
</abstract>
<kwd-group xml:lang="en"><title>Keywords</title>
<kwd>Bisphenol A</kwd>
<kwd>Cardiovascular disease</kwd>
<kwd>Diabetes</kwd>
<kwd>Epidemiology</kwd>
<kwd>Hyperglycemia</kwd>
<kwd>Hypertension</kwd>
<kwd>Meta-analysis</kwd>
<kwd>Obesity</kwd>
<kwd>Overweight</kwd>
<kwd>Systematic review</kwd>
</kwd-group>
<custom-meta-group><custom-meta><meta-name>issue-copyright-statement</meta-name>
<meta-value>© The Author(s) 2015</meta-value>
</custom-meta>
</custom-meta-group>
</article-meta>
</front>
<body><sec id="Sec1" sec-type="introduction"><title>Introduction</title>
<p>In recent decades, large and rapid increases in diabetes and obesity prevalence have been observed worldwide. Apart from traditional risk factors such as family history, sedentary lifestyle and energy dense dietary intake, attention has recently turned to environmental toxicants called endocrine-disrupting chemicals (EDCs) because of their ability to interfere with synthesis, secretion, transport, metabolism, binding action, or elimination of natural blood-borne hormones, and to induce obesogenic or diabetogenic effects [<xref ref-type="bibr" rid="CR1">1</xref>
]. In particular, bisphenol A (BPA) has been strongly suspected as a potential contributor to these disease aetiologies [<xref ref-type="bibr" rid="CR2">2</xref>
–<xref ref-type="bibr" rid="CR5">5</xref>
].</p>
<p>BPA is a synthetic monomer used in the manufacture of polycarbonate plastics and epoxy resins, with a world production estimated at 3.8 million tons in 2006 [<xref ref-type="bibr" rid="CR6">6</xref>
]. Importantly, this production of BPA is expected to increase further in the coming years, given the robust demand for polycarbonate plastics and epoxy resins from China [<xref ref-type="bibr" rid="CR7">7</xref>
] and other emerging markets. The primary source of human exposure to BPA is presumed to be <italic>via</italic>
the ingestion of food which has been stored or reheated in BPA-lined containers, but recent data suggest there is at least some exposure from drinking water, dental sealants, thermal paper and, to a lesser extent, inhalation of household dust particles [<xref ref-type="bibr" rid="CR8">8</xref>
–<xref ref-type="bibr" rid="CR12">12</xref>
]. BPA is ubiquitous in our environment, as evidenced by the fact that over 90 % of individuals have detectable levels of BPA present in their urine [<xref ref-type="bibr" rid="CR13">13</xref>
], which is the primary route of excretion in humans [<xref ref-type="bibr" rid="CR14">14</xref>
]. BPA has been found in neonates, children and adults [<xref ref-type="bibr" rid="CR13">13</xref>
], and can be measured in a range of bodily fluids and tissues, including urine, blood, saliva, placental tissue, adipose tissue and breast milk [<xref ref-type="bibr" rid="CR13">13</xref>
, <xref ref-type="bibr" rid="CR15">15</xref>
].</p>
<p>There is accumulating <italic>in vitro</italic>
and animal data (small and large animal) supporting a role of BPA in the development of diabetes, supporting a role of BPA in the development of diabetes, cardiovascular disease (CVD) and obesity. BPA is structurally similar to 17β-estradiol and thus binds to estrogen-related receptors (ER) such as ERα, ERβ and ERγ, the G protein-coupled estrogen receptor GPR30, and the peroxisome proliferator-activated receptor gamma (PPAR-γ) [<xref ref-type="bibr" rid="CR16">16</xref>
, <xref ref-type="bibr" rid="CR17">17</xref>
]. While the mechanisms of action are not fully understood, binding of BPA to these receptors has been shown to induce insulin resistance, adipogenesis, pancreatic beta-cell dysfunction, inflammation, and oxidative stress [<xref ref-type="bibr" rid="CR3">3</xref>
, <xref ref-type="bibr" rid="CR18">18</xref>
–<xref ref-type="bibr" rid="CR20">20</xref>
]. At concentrations typically seen in humans, BPA has been shown to act <italic>via</italic>
extranuclear ERα [<xref ref-type="bibr" rid="CR21">21</xref>
] and ERβ [<xref ref-type="bibr" rid="CR22">22</xref>
]. These two studies used β-cells and whole islets of Langerhans from mice lacking ERα and ERβ and humans to demonstrate that the low dose effect of BPA is mediated <italic>via</italic>
these estrogen receptors. Other experimental studies have also shown that BPA at environmentally relevant doses could inhibit the release of adiponectin, an adipokine that protects humans from obesity-related metabolic syndrome [<xref ref-type="bibr" rid="CR23">23</xref>
]. It also may have direct pro-angiogenic effects on human primary endothelial cells, suggesting that the human endothelium may be an important target for BPA [<xref ref-type="bibr" rid="CR24">24</xref>
]. Recently, Marmugi et al. showed that BPA exposure for 8 months in adult mice resulted in increased adipose tissue mass, hyperglycaemia, glucose intolerance, hypercholesterolemia and increased cholesterol biosynthesis by the liver [<xref ref-type="bibr" rid="CR25">25</xref>
]. However, the relevance of animal studies to humans remains unclear due to enterohepatic recirculation in rodents, resulting in a slower rate of BPA excretion compared with humans [<xref ref-type="bibr" rid="CR14">14</xref>
].</p>
<p>Given the ongoing policy debate on the possible public health benefits of minimizing BPA exposure, there is an urgent need for research to adequately evaluate cardiometabolic health in relation to BPA exposure. The past 10 years have seen a rapid increase in published reports of human, population-based epidemiological studies linking BPA to obesity, diabetes and CVD, most of which are cross-sectional studies. To date, three reviews have evaluated the available literature concerning BPA and chronic disease in humans [<xref ref-type="bibr" rid="CR26">26</xref>
–<xref ref-type="bibr" rid="CR28">28</xref>
]. However, the authors did not perform meta-analysis and, as the body of literature is growing rapidly, important new evidence can appear within short timelines [<xref ref-type="bibr" rid="CR29">29</xref>
]. Thus the aims of the present review were:<list list-type="order"><list-item><p>to provide insight into the most recent epidemiological evidence on the association between urinary BPA (uBPA) concentrations and chronic, cardiometabolic disorders (diabetes, overweight, obesity, CVD and hypertension);</p>
</list-item>
<list-item><p>to carry out meta-analysis when feasible; and</p>
</list-item>
<list-item><p>to identify the gaps in research that will allow for a comprehensive assessment of possible risk to humans.</p>
</list-item>
</list>
</p>
</sec>
<sec id="Sec2" sec-type="materials|methods"><title>Methods</title>
<p>This review follows PRISMA guidelines for systematic reviews of observational studies [<xref ref-type="bibr" rid="CR30">30</xref>
].</p>
<sec id="Sec3"><title>Eligibility criteria</title>
<p>Studies were included if the following inclusion criteria were met:<list list-type="bullet"><list-item><p><italic>Participants</italic>
– Human studies including adults or children (however only diabetes in adults, in an attempt to limit the analysis to type 2)</p>
</list-item>
<list-item><p><italic>Outcomes</italic>
– Studies examining diabetes, hyperglycemia, measures of anthropometry/adiposity, CVD or hypertension. Surrogate cardiometabolic outcomes such as blood cholesterol levels and insulin sensitivity indices (e.g., Homeostasis Model Assessment of Insulin Resistance [HOMA], Quantitative Insulin Sensitivity Check Index [QUICKI], Matsuda Index) were not considered.</p>
</list-item>
<list-item><p><italic>Exposure</italic>
– Urinary measures of BPA and/or BPA metabolites (studies examining BPA exposure in pregnant women in relation to outcome in the offspring were beyond the scope of this review)</p>
</list-item>
<list-item><p><italic>Sample size</italic>
– Studies including at least 100 participants,</p>
</list-item>
<list-item><p><italic>Language</italic>
– Studies published in English,</p>
</list-item>
<list-item><p><italic>Appropriate statistical adjustment</italic>
– Models including adjustment for confounders (at least age and gender).</p>
</list-item>
</list>
</p>
</sec>
<sec id="Sec4"><title>Information sources and search</title>
<p>PubMed and Embase databases were searched to identify potential studies for this review published up to August 2014. The keywords (and corresponding Medical Subject Heading [MeSH] terms for the search in PubMed) ‘body mass index’, ‘overweight’, ‘obesity’, ‘waist circumference’, ‘body weight’, ‘abdominal obesity’, ‘cardiovascular disease’, ‘coronary heart disease’, ‘diabetes’, ‘hypertension’, ‘blood pressure’, ‘insulin resistance’, ‘glucose intolerance’ were combined with the Boolean operator ‘OR’. The key term ‘Bisphenol A’ was entered and combined with the former using the Boolean operator ‘AND’. The full electronic search strategy in PubMed is reported in the Additional file <xref rid="MOESM1" ref-type="media">1</xref>
: Figure S1. References from identified studies were hand-searched to ensure that no relevant studies were missed.</p>
</sec>
<sec id="Sec5"><title>Study selection and data extraction</title>
<p>All the identified publications were evaluated for relevance by two independent reviewers (DJM, FR), on the basis of their titles and abstracts; any disagreement was resolved by discussion. Full texts of the selected abstracts were then checked for the inclusion criteria by the reviewers. Final eligibility of studies was decided by consensus.</p>
<p>Summary data for included studies were extracted into a standardized tool that included: study design, country, population, sample size, age, gender, ethnicity, outcome definition, method of exposure measurement, uBPA levels and categorization, results expressed as adjusted odds ratios (OR), hazard ratios (HR) or β-coefficients, and variables used in adjustment.</p>
<p>The quality of individual studies, with regard to the outcomes of interest, was independently assessed by two investigators. We utilised a scoring system based on the established OHAT guidelines [<xref ref-type="bibr" rid="CR31">31</xref>
] adapted to reflect the characteristics of the included studies: longitudinal design (2 points), population-based study (1 point), outcome assessment including measurements (1 point), collection of at least 2 urine samples per participant (1 point), control for urine dilution (1 point), adjustment for dietary intake (1 point), and adjustment for socioeconomic variables (1 point). Studies were then classified as ‘low quality’ (total score between 0 and 2), ‘medium quality’ (total score between 3 and 5), or ‘high quality’ (total score between 6 and 8).</p>
</sec>
<sec id="Sec6"><title>Meta-analysis</title>
<p>We appraised each study to examine sources of heterogeneity, including difference in clinical outcomes and exposure measurements. Participant overlap between related studies was examined. For studies that used similar sources of data (e.g., surveys of National Health and Nutrition Examination Survey [NHANES], over concurrent periods and similar age range), only the study with the largest data set was included in the meta-analysis.</p>
<p>For each outcome, two studies with comparable outcome and exposure definitions were sufficient to perform a meta-analysis. For anthropometric outcomes, we performed pooled and separate analysis for children and adults. ORs with corresponding confidence intervals (CIs) were extracted from the most adjusted model. For summary purposes, we pooled OR estimates comparing extreme categories of uBPA levels (the highest vs. lowest uBPA levels). A random effects model was used. The logarithm of the OR and its standard error (SE) was calculated using the formula of log (upper limit of 95 % CI) minus log (lower limit of 95 % CI) divided by 3.92 (2*1.96, the 97.5th percentile of the standard normal distribution) and was entered into REVMAN 5.1 software (REVMAN 2011). Heterogeneity between studies was tested using Chi-squared test and quantified by calculating the I<sup>2</sup>
statistic. We produced forest plots to visually assess the individual study ORs and overall ORs, with corresponding 95 % CIs.</p>
</sec>
</sec>
<sec id="Sec7" sec-type="results"><title>Results</title>
<sec id="Sec8"><title>Study selection</title>
<p>The initial search identified 953 studies in total. Of these, 895 studies were excluded after screening of the titles/abstracts (studies did not meet inclusion criteria e.g., were animal or <italic>in vitro</italic>
studies, reported only serum BPA levels, or were review/commentary articles). Fifty eight studies were thus identified and reviewed in full-text versions, from which 33 studies were selected to be included in the systematic review (Fig. <xref rid="Fig1" ref-type="fig">1</xref>
).<fig id="Fig1"><label>Fig. 1</label>
<caption><p>Flow diagram of the search strategy for the systematic review (some studies reported on several outcomes)</p>
</caption>
<graphic xlink:href="12940_2015_36_Fig1_HTML" id="MO1"></graphic>
</fig>
</p>
<p>Twelve independent cross-sectional studies were selected for quantitative synthesis, making meta-analysis possible for 5 health outcomes: diabetes, overweight, obesity, elevated waist circumference (WC) and hypertension. Individual and pooled OR estimates are shown in the Additional file <xref rid="MOESM1" ref-type="media">1</xref>
: Figure S2. Studies included and excluded from meta-analysis and reasons for exclusion are summarized in the Additional file <xref rid="MOESM1" ref-type="media">1</xref>
: Table S1.</p>
</sec>
<sec id="Sec9"><title>Characteristics of studies</title>
<p>Characteristics for each of the 33 articles included in the review are summarized in Table <xref rid="Tab1" ref-type="table">1</xref>
and detailed in the Additional file <xref rid="MOESM1" ref-type="media">1</xref>
: Table S2.<table-wrap id="Tab1"><label>Table 1</label>
<caption><p>Summary characteristics of studies included in the systematic review (<italic>n</italic>
= 33 studies)</p>
</caption>
<table frame="hsides" rules="groups"><thead><tr><th>Study characteristics</th>
<th><italic>n</italic>
</th>
</tr>
</thead>
<tbody><tr><td>Year of publication</td>
<td></td>
</tr>
<tr><td> 2008</td>
<td>1</td>
</tr>
<tr><td> 2009</td>
<td>0</td>
</tr>
<tr><td> 2010</td>
<td>2</td>
</tr>
<tr><td> 2011</td>
<td>5</td>
</tr>
<tr><td> 2012</td>
<td>10</td>
</tr>
<tr><td> 2013</td>
<td>8</td>
</tr>
<tr><td> 2014</td>
<td>7</td>
</tr>
<tr><td>Geographical setting</td>
<td></td>
</tr>
<tr><td> Asia</td>
<td>10</td>
</tr>
<tr><td> Europe</td>
<td>3</td>
</tr>
<tr><td> North America</td>
<td>20</td>
</tr>
<tr><td>Design</td>
<td></td>
</tr>
<tr><td> Cross-sectional</td>
<td>28</td>
</tr>
<tr><td> Prospective</td>
<td>5</td>
</tr>
<tr><td>Age category</td>
<td></td>
</tr>
<tr><td> Children</td>
<td>8</td>
</tr>
<tr><td> Adults</td>
<td>25</td>
</tr>
<tr><td>Gender</td>
<td></td>
</tr>
<tr><td> Mixed</td>
<td>30</td>
</tr>
<tr><td> Women only</td>
<td>3</td>
</tr>
<tr><td>Sample size</td>
<td></td>
</tr>
<tr><td> <500</td>
<td>5</td>
</tr>
<tr><td> 500–1000</td>
<td>4</td>
</tr>
<tr><td> 1001–2000</td>
<td>9</td>
</tr>
<tr><td> 2001–3000</td>
<td>6</td>
</tr>
<tr><td> 3001–4000</td>
<td>6</td>
</tr>
<tr><td> 4001–5000</td>
<td>3</td>
</tr>
<tr><td>Health outcomes<sup>a</sup>
</td>
<td></td>
</tr>
<tr><td> Diabetes</td>
<td>9</td>
</tr>
<tr><td> Prediabetes</td>
<td>1</td>
</tr>
<tr><td> Hyperglycemia</td>
<td>2</td>
</tr>
<tr><td> Overweight</td>
<td>7</td>
</tr>
<tr><td> Obesity</td>
<td>7</td>
</tr>
<tr><td> Elevated waist circumference</td>
<td>5</td>
</tr>
<tr><td> Cardiovascular disease</td>
<td>6</td>
</tr>
<tr><td> Hypertension</td>
<td>3</td>
</tr>
<tr><td>Urinary sample</td>
<td></td>
</tr>
<tr><td> Spot sample</td>
<td>27</td>
</tr>
<tr><td> First-morning-void sample</td>
<td>3</td>
</tr>
<tr><td> Second-morning void sample</td>
<td>1</td>
</tr>
<tr><td> 12-h sample</td>
<td>1</td>
</tr>
<tr><td> 24-h sample</td>
<td>1</td>
</tr>
</tbody>
</table>
<table-wrap-foot><p><sup>a</sup>
Some studies reported on several outcomes</p>
</table-wrap-foot>
</table-wrap>
</p>
<sec id="Sec10"><title>Study design and population</title>
<p>This systematic review includes 28 cross-sectional and 5 longitudinal studies, drawn from 19 different study populations and 6 different countries. Sample sizes ranged from 239 [<xref ref-type="bibr" rid="CR32">32</xref>
] to 4811 [<xref ref-type="bibr" rid="CR33">33</xref>
] representing a total of 69,486 participants, not accounting for participant overlap across publications utilizing data from the same study populations.</p>
<p>Among the cross-sectional studies, 16 (57 %) used study populations from the NHANES study (cycles ranging from the years 2003 to 2010) [<xref ref-type="bibr" rid="CR33">33</xref>
–<xref ref-type="bibr" rid="CR48">48</xref>
]. Potential overlap between all publications using data from NHANES is summarized in the Additional file <xref rid="MOESM1" ref-type="media">1</xref>
: Table S3. Five cross-sectional studies (18 %) used Chinese populations [<xref ref-type="bibr" rid="CR49">49</xref>
–<xref ref-type="bibr" rid="CR53">53</xref>
], including two studies using the same population sample from Songnan Community in Shanghai [<xref ref-type="bibr" rid="CR51">51</xref>
, <xref ref-type="bibr" rid="CR52">52</xref>
]. Four cross-sectional studies (14 %) used a Korean population [<xref ref-type="bibr" rid="CR54">54</xref>
–<xref ref-type="bibr" rid="CR57">57</xref>
], while other single studies were conducted in Italians [<xref ref-type="bibr" rid="CR58">58</xref>
], Iranians [<xref ref-type="bibr" rid="CR32">32</xref>
], and British populations [<xref ref-type="bibr" rid="CR59">59</xref>
]. Of the 5 prospective studies, one was on the EPIC-Norfolk study (UK) [<xref ref-type="bibr" rid="CR60">60</xref>
] and 4 from U.S. cohorts, NHS and NHSII [<xref ref-type="bibr" rid="CR61">61</xref>
, <xref ref-type="bibr" rid="CR62">62</xref>
], HOME [<xref ref-type="bibr" rid="CR63">63</xref>
] and CHAMACOS [<xref ref-type="bibr" rid="CR64">64</xref>
].</p>
<p>Of the 16 NHANES publications, 11 investigated adults [<xref ref-type="bibr" rid="CR34">34</xref>
, <xref ref-type="bibr" rid="CR36">36</xref>
, <xref ref-type="bibr" rid="CR37">37</xref>
, <xref ref-type="bibr" rid="CR39">39</xref>
–<xref ref-type="bibr" rid="CR46">46</xref>
], while four restricted their study population to children/teenagers [<xref ref-type="bibr" rid="CR35">35</xref>
, <xref ref-type="bibr" rid="CR38">38</xref>
, <xref ref-type="bibr" rid="CR47">47</xref>
, <xref ref-type="bibr" rid="CR48">48</xref>
]. One further study examined adults for CVD outcomes; however this study was excluded from the diabetes outcome analysis because the study population included a mixed sample of children and adults [<xref ref-type="bibr" rid="CR33">33</xref>
]. Of the 12 other cross-sectional studies, 10 were conducted in adult populations [<xref ref-type="bibr" rid="CR32">32</xref>
, <xref ref-type="bibr" rid="CR51">51</xref>
–<xref ref-type="bibr" rid="CR59">59</xref>
], and 2 in school-age children [<xref ref-type="bibr" rid="CR49">49</xref>
, <xref ref-type="bibr" rid="CR50">50</xref>
]. Three of the prospective studies were conducted in adults [<xref ref-type="bibr" rid="CR60">60</xref>
–<xref ref-type="bibr" rid="CR62">62</xref>
]. Of the two in children [<xref ref-type="bibr" rid="CR63">63</xref>
, <xref ref-type="bibr" rid="CR64">64</xref>
], follow-up for the infants in the HOME study was at age 1 and 2 years [<xref ref-type="bibr" rid="CR63">63</xref>
], and for children from the CHAMACOS cohort at 5 and 9 years old [<xref ref-type="bibr" rid="CR64">64</xref>
].</p>
<p>All NHANES cycles as well as the NHS, NHSII and HOME cohorts comprised multiple ethnicities, but were predominantly non-Hispanic white. Mothers of children from the CHAMACOS cohort were mostly Latina. In 10 publications, all participants were Asian, from China [<xref ref-type="bibr" rid="CR49">49</xref>
–<xref ref-type="bibr" rid="CR53">53</xref>
], South Korea [<xref ref-type="bibr" rid="CR54">54</xref>
–<xref ref-type="bibr" rid="CR57">57</xref>
] or Iran [<xref ref-type="bibr" rid="CR32">32</xref>
].</p>
</sec>
<sec id="Sec11"><title>Outcomes</title>
<p>This review included 12 publications on abnormal glucose tolerance (9, 2 and 1 with outcomes of diabetes, hyperglycemia and prediabetes, respectively), 16 publications on anthropometry (7 with an outcome of overweight, 7 with obesity and 5 with elevated WC), 6 publications on CVD and 3 on hypertension.</p>
</sec>
<sec id="Sec12"><title>Urinary BPA assessment and levels</title>
<p>All the studies used total (unconjugated and conjugated) uBPA concentration as the exposure variable. The majority of studies relied on a single uBPA measurement, however 3 assessed BPA exposure using repeated measurements: 2 follow-up assessments in paediatric studies [<xref ref-type="bibr" rid="CR63">63</xref>
, <xref ref-type="bibr" rid="CR64">64</xref>
], and up to 5 measurements during the study period in an adult study [<xref ref-type="bibr" rid="CR54">54</xref>
].</p>
<p>The highest uBPA mean concentration was reported in a study in children within the NHANES 2003/08 cycles [<xref ref-type="bibr" rid="CR35">35</xref>
], with a mean (SE) of 5.0 (0.3) ng/mL in boys and 4.6 (0.3) ng/mL in girls. The earliest NHANES (2003/2004) study had the highest mean levels of BPA, and median BPA concentration followed a downward trend across subsequent NHANES cycles [<xref ref-type="bibr" rid="CR37">37</xref>
]. The lowest uBPA concentration was reported in a cross-sectional study conducted in Chinese school children in 2011 [<xref ref-type="bibr" rid="CR50">50</xref>
], with a median (interquartile range, IQR) of 0.60 (0.20–1.37) ng/mL.</p>
</sec>
<sec id="Sec13"><title>Covariates</title>
<p>Tables <xref rid="Tab2" ref-type="table">2</xref>
, <xref rid="Tab3" ref-type="table">3</xref>
and <xref rid="Tab4" ref-type="table">4</xref>
describe all variables used for the adjustment in the statistical analyses for each separate publication. All models were adjusted for at least age and gender. In order to correct for urine dilution, the majority of studies adjusted for an indicator of renal function, either urinary creatinine [<xref ref-type="bibr" rid="CR33">33</xref>
–<xref ref-type="bibr" rid="CR40">40</xref>
, <xref ref-type="bibr" rid="CR42">42</xref>
, <xref ref-type="bibr" rid="CR45">45</xref>
–<xref ref-type="bibr" rid="CR48">48</xref>
, <xref ref-type="bibr" rid="CR52">52</xref>
, <xref ref-type="bibr" rid="CR55">55</xref>
–<xref ref-type="bibr" rid="CR57">57</xref>
, <xref ref-type="bibr" rid="CR60">60</xref>
–<xref ref-type="bibr" rid="CR62">62</xref>
, <xref ref-type="bibr" rid="CR64">64</xref>
], estimated glomerular filtration rate (eGFR) [<xref ref-type="bibr" rid="CR51">51</xref>
], specific gravity [<xref ref-type="bibr" rid="CR50">50</xref>
], or serum creatinine [<xref ref-type="bibr" rid="CR32">32</xref>
]. Four studies corrected for renal function using the ratio of BPA-to-creatinine as the exposure variable [<xref ref-type="bibr" rid="CR34">34</xref>
, <xref ref-type="bibr" rid="CR54">54</xref>
, <xref ref-type="bibr" rid="CR63">63</xref>
, <xref ref-type="bibr" rid="CR64">64</xref>
]. All but 4 adult studies adjusted for smoking [<xref ref-type="bibr" rid="CR32">32</xref>
, <xref ref-type="bibr" rid="CR51">51</xref>
, <xref ref-type="bibr" rid="CR53">53</xref>
, <xref ref-type="bibr" rid="CR58">58</xref>
], and in the studies of children, smoking exposure was assessed by urine cotinine [<xref ref-type="bibr" rid="CR35">35</xref>
, <xref ref-type="bibr" rid="CR38">38</xref>
, <xref ref-type="bibr" rid="CR47">47</xref>
, <xref ref-type="bibr" rid="CR48">48</xref>
, <xref ref-type="bibr" rid="CR63">63</xref>
, <xref ref-type="bibr" rid="CR64">64</xref>
] or questionnaire [<xref ref-type="bibr" rid="CR64">64</xref>
]. For the studies that investigated glucose, CVD or hypertension as the outcome, all except one [<xref ref-type="bibr" rid="CR34">34</xref>
] adjusted for WC [<xref ref-type="bibr" rid="CR33">33</xref>
, <xref ref-type="bibr" rid="CR37">37</xref>
, <xref ref-type="bibr" rid="CR40">40</xref>
, <xref ref-type="bibr" rid="CR46">46</xref>
, <xref ref-type="bibr" rid="CR51">51</xref>
], body mass index (BMI) [<xref ref-type="bibr" rid="CR32">32</xref>
, <xref ref-type="bibr" rid="CR33">33</xref>
, <xref ref-type="bibr" rid="CR37">37</xref>
–<xref ref-type="bibr" rid="CR41">41</xref>
, <xref ref-type="bibr" rid="CR43">43</xref>
, <xref ref-type="bibr" rid="CR45">45</xref>
, <xref ref-type="bibr" rid="CR46">46</xref>
, <xref ref-type="bibr" rid="CR56">56</xref>
, <xref ref-type="bibr" rid="CR59">59</xref>
–<xref ref-type="bibr" rid="CR61">61</xref>
] or both height and weight [<xref ref-type="bibr" rid="CR54">54</xref>
].<table-wrap id="Tab2"><label>Table 2</label>
<caption><p>Summary of results in studies used as primary data: diabetes, prediabetes and hyperglycemia (<italic>n</italic>
= 12 publications)</p>
</caption>
<table frame="hsides" rules="groups"><thead><tr><th>Reference</th>
<th>Outcomes & definitions used</th>
<th>Urinary BPA categorisation</th>
<th>Main results</th>
<th>Adjustment in model(s) used for review</th>
</tr>
</thead>
<tbody><tr><td colspan="5">Prevalent diabetes (8 publications)</td>
</tr>
<tr><td>Ahmadkhaniha et al. 2014 [<xref ref-type="bibr" rid="CR32">32</xref>
]</td>
<td>Type 2 diabetes: self-reported and doctor-diagnosed T2D according to the ADA guideline (FPG >126 mg/dL, HbA1c >6.5 %) for more than one year</td>
<td>BPA in two groups based on the median (<0.85 and ≥0.85 μg/L)</td>
<td>OR = 57.6 (21.1–157.05)</td>
<td>Age, sex, BMI, hypertension, serum triglyceride level, serum cholesterol level, serum creatinine (smoking and consumption of sugared drinks in plastic bottles or canned food in two past weeks were exclusion criteria)</td>
</tr>
<tr><td rowspan="14">Casey & Neidell 2013 [<xref ref-type="bibr" rid="CR37">37</xref>
]</td>
<td rowspan="14">Diabetes: self-report of doctor diagnosis</td>
<td rowspan="5">BPA continuous (not log-transformed)</td>
<td>Per SD increase:</td>
<td rowspan="14">Age, sex, urinary creatinine concentration, race/ethnicity, income, smoking, body mass index, waist circumference, veteran/military status, citizenship status, marital status, household size, pregnancy status, language at subject interview, health insurance coverage, employment status in the prior week, consumption of bottled water in the past 24 h, consumption of alcohol, annual consumption of tuna fish, presence of emotional support in one’s life, being on a diet, using a water treatment device, access to a routine source of health care, vaccinated for Hepatitis A or B, consumption of dietary supplements (vitamins or minerals), inability to purchase balanced meals on a consistent basis + survey cycle for pooled analyses</td>
</tr>
<tr><td>2003/04: OR = 1.398 (1.183–1.653)</td>
</tr>
<tr><td>2005/06: OR = 1.008 (0.861–1.181)</td>
</tr>
<tr><td>2007/08: OR = 0.716 (0.500–1.025)</td>
</tr>
<tr><td>Pooled 2003/08: OR = 1.065 (0.973–1.166)</td>
</tr>
<tr><td rowspan="5">BPA continuous (log-transformed)</td>
<td>Per 10-fold increase:</td>
</tr>
<tr><td>2003/04: OR = 1.492 (1.267–1.757)</td>
</tr>
<tr><td>2005/06: OR = 1.230 (0.894–1.694)</td>
</tr>
<tr><td>2007/08: OR = 0.932 (0.759–1.146)</td>
</tr>
<tr><td>Pooled 2003/08: OR = 1.202 (1.049–1.377)</td>
</tr>
<tr><td rowspan="4">BPA in quartiles (ng/mL): <break></break>
Q1: <1.2; Q2: 1.2–2.2; Q3: 2.3–4.2; Q4: >4.2</td>
<td>Pooled 2003/08:</td>
</tr>
<tr><td>Q2 vs. Q1: OR = 1.443 (0.982–2.119)</td>
</tr>
<tr><td>Q3 vs. Q1: OR = 1.512 (0.998–2.289)</td>
</tr>
<tr><td>Q4 vs. Q1: OR = 1.760 (1.137–2.724)</td>
</tr>
<tr><td rowspan="4">Kim & Park 2013 [<xref ref-type="bibr" rid="CR56">56</xref>
]</td>
<td rowspan="4">Type 2 diabetes: self-reported and doctor-diagnosed</td>
<td rowspan="4">BPA in quartiles (ng/mL): <break></break>
Q1: <1.36; Q2: 1.36–2.14; Q3: 2.15–3.32; Q4: >3.32</td>
<td>Q2 vs. Q1: OR = 1.23 (0.62–2.43)</td>
<td rowspan="4">Urinary creatinine, age, sex, BMI, education, cigarette smoking, income, place of residence</td>
</tr>
<tr><td>Q3 vs. Q1: OR = 1.17 (0.60–2.28)</td>
</tr>
<tr><td>Q4 vs. Q1: OR = 1.71 (0.89–3.26)</td>
</tr>
<tr><td>p for trend = 0.374</td>
</tr>
<tr><td rowspan="2">Lang et al. 2008 [<xref ref-type="bibr" rid="CR39">39</xref>
]</td>
<td rowspan="2">Diabetes: self-report of doctor diagnosis</td>
<td rowspan="2">BPA continuous</td>
<td>Per SD increase:</td>
<td rowspan="2">Age, sex, race/ethnicity, education, income, BMI, WC, smoking status, urinary creatinine</td>
</tr>
<tr><td>OR = 1.39 (1.21–1.60)</td>
</tr>
<tr><td rowspan="4">Melzer et al. 2010 [<xref ref-type="bibr" rid="CR40">40</xref>
]</td>
<td rowspan="4">Diabetes: self-report of doctor diagnosis</td>
<td rowspan="4">BPA continuous</td>
<td>Per SD increase:</td>
<td rowspan="4">Age, gender, ethnicity, education, income, BMI, WC, smoking status, urinary creatinine</td>
</tr>
<tr><td>2003/04: OR = 1.40 (1.25–1.56)</td>
</tr>
<tr><td>2005/06: OR = 1.02 (0.76–1.38)</td>
</tr>
<tr><td>Pooled 2003/06: OR = 1.24 (1.10–1.40)</td>
</tr>
<tr><td rowspan="4">Ning et al. 2011 [<xref ref-type="bibr" rid="CR51">51</xref>
]</td>
<td rowspan="4">Type 2 diabetes: FPG ≥7.0 mmol/L or plasma glucose ≥11.1 mmol/L two hours after oral glucose tolerance test or use of diabetes medication</td>
<td rowspan="4">BPA in quartiles (ng/mL): <break></break>
Q1: ≤0.47; Q2: 0.48 –0.81; Q3: 0.82–1.43; Q4: >1.43</td>
<td>Q2 vs. Q1: OR = 1.30 (1.03–1.64)</td>
<td rowspan="4">Age, sex, educational level, family history of diabetes, WC, systolic blood pressure, ln(TG level), ln(hsCRP level), ln(ALT level), estimated glomerular filtration rate, albumin level, total bilirubin level</td>
</tr>
<tr><td>Q3 vs. Q1: OR = 1.09 (0.86–1.39)</td>
</tr>
<tr><td>Q4 vs. Q1: OR = 1.37 (1.08–1.74)</td>
</tr>
<tr><td>p for trend not statistically significant</td>
</tr>
<tr><td rowspan="8">Shankar & Teppala 2011 [<xref ref-type="bibr" rid="CR42">42</xref>
]</td>
<td rowspan="8">Diabetes: fasting serum glucose >126 mg/dL or non-fasting serum glucose >200 mg/dL or HbA1c >6.5 % or self-reported current use of oral hypoglycemic medication or insulin</td>
<td rowspan="4">BPA in quartiles (ng/mL): <break></break>
Q1: <1.10; Q2: 1.10–2.10; Q3: 2.11–4.20; Q4: >4.20</td>
<td>Q2 vs. Q1: OR = 1.42 (1.03–1.96)</td>
<td rowspan="8">Age, gender, race-ethnicity, education categories, smoking, alcohol intake, BMI, systolic and diastolic blood pressure, urinary creatinine, total cholesterol</td>
</tr>
<tr><td>Q3 vs. Q1: OR = 1.48 (1.05–2.08)</td>
</tr>
<tr><td>Q4 vs. Q1: OR = 1.68 (1.22–2.30)</td>
</tr>
<tr><td>p for trend = 0.002</td>
</tr>
<tr><td rowspan="4"></td>
<td>Normal weight participants:</td>
</tr>
<tr><td>Q4 vs. Q1: OR = 3.17 (1.23–8.18)</td>
</tr>
<tr><td>Overweight/obese participants:</td>
</tr>
<tr><td>Q4 vs. Q1: OR = 1.56 (1.09–2.24)</td>
</tr>
<tr><td rowspan="5">Silver et al. 2011 [<xref ref-type="bibr" rid="CR46">46</xref>
]</td>
<td rowspan="5">Type 2 diabetes: HbA1c ≥6.5 % or self-reported use of diabetes medication (insulin or blood sugar-lowering pills)</td>
<td rowspan="5">BPA continuous (log-transformed)</td>
<td>For a doubling in uBPA concentration:</td>
<td rowspan="5">Age, age<sup>2</sup>
, urinary creatinine as natural splines with 4° of freedom, gender, race-ethnicity, education, household income, BMI, WC, smoking status</td>
</tr>
<tr><td>2003/04: OR = 1.23 (1.07–1.41)</td>
</tr>
<tr><td>2005/06: OR = 1.06 (0.95–1.19)</td>
</tr>
<tr><td>2007/08: OR = 1.06 (0.91–1.23)</td>
</tr>
<tr><td>Pooled 2003/08: OR = 1.08 (1.02–1.16)</td>
</tr>
<tr><td colspan="5">Incident diabetes (1 publication)</td>
</tr>
<tr><td rowspan="11">Sun et al. 2014 [<xref ref-type="bibr" rid="CR61">61</xref>
]</td>
<td rowspan="6">Type 2 diabetes: self-reported diagnosis confirmed with one of the ADA 1998 criteria: a) elevated glucose concentration and ≥1 symptom related to diabetes; b) no symptoms but elevated glucose concentrations on 2 separate occasions; or c) treatment with insulin or oral hypoglycemic medication</td>
<td>BPA in quartiles (ng/mL):</td>
<td>NHS cohort (older women):</td>
<td rowspan="11">Age at urine sample collection, ethnicity, fasting status, time of sample collection, menopausal status, use of hormone replacement therapy (NHSII only), urinary creatinine levels, smoking status, postmenopausal hormone use (NHS only), oral contraceptive use (NHSII only), physical activity, alcohol use, family history of diabetes, history of hypercholesterolemia or hypertension, Alternative Health Eating Index score, BMI</td>
</tr>
<tr><td>NHS cohort / NHSII cohort</td>
<td>Q2 vs. Q1: OR = 0.91 (0.56–1.48)</td>
</tr>
<tr><td>Q1: <1.0 / <1.3</td>
<td>Q3 vs. Q1: OR = 0.98 (0.60–1.61)</td>
</tr>
<tr><td>Q2: 1.0–1.5 / 1.3–2.0</td>
<td>Q4 vs. Q1: OR = 0.81 (0.48–1.38)</td>
</tr>
<tr><td>Q3: 1.5–2.7 / 2.0–3.5</td>
<td rowspan="2">p for trend = 0.45</td>
</tr>
<tr><td>Q4: >2.7 / >3.5</td>
</tr>
<tr><td rowspan="5"></td>
<td rowspan="5"></td>
<td>NHSII cohort (younger women):</td>
</tr>
<tr><td>Q2 vs. Q1: OR = 1.34 (0.70–2.27)</td>
</tr>
<tr><td>Q3 vs. Q1: OR = 1.91 (1.11–3.29)</td>
</tr>
<tr><td>Q4 vs. Q1: OR = 2.08 (1.17–3.69)</td>
</tr>
<tr><td>p for trend = 0.02</td>
</tr>
<tr><td colspan="5">Prevalent prediabetes (1 publication)</td>
</tr>
<tr><td rowspan="12">Sabanayagam et al. 2013 [<xref ref-type="bibr" rid="CR41">41</xref>
]</td>
<td rowspan="12">Prediabetes: FPG = 100-125 mg/dL or 2-h glucose concentration = 140–199 mg/dL or HbA1c = 5.7–6.4 % (ADA guidelines)</td>
<td rowspan="12">BPA in tertiles (ng/mL): <break></break>
T1: <1.3; T2: 1.3–3.2; T3: >3.2</td>
<td>T2 vs. T1: OR = 1.42 (1.14–1.76)</td>
<td rowspan="12">Age, gender, race-ethnicity, education, smoking, alcohol intake, BMI, physical inactivity, mean arterial blood pressure, C-reactive protein, total cholesterol/HDL ratio</td>
</tr>
<tr><td>T3 vs. T1: OR = 1.34 (1.03–1.73)</td>
</tr>
<tr><td>p for trend = 0.02</td>
</tr>
<tr><td>Stronger associations among women and obese participants.</td>
</tr>
<tr><td>Women:</td>
</tr>
<tr><td>T2 vs. T1: OR = 1.36 (0.96–1.91)</td>
</tr>
<tr><td>T3 vs. T1: OR = 1.49 (1.00–2.22)</td>
</tr>
<tr><td>p for trend = 0.04</td>
</tr>
<tr><td>Obese:</td>
</tr>
<tr><td>T2 vs. T1: OR = 1.71 (1.05–2.80)</td>
</tr>
<tr><td>T3 vs. T1: OR = 1.65 (1.04–2.80)</td>
</tr>
<tr><td>p for trend = 0.04</td>
</tr>
<tr><td colspan="5">Prevalent hyperglycemia (2 publications)</td>
</tr>
<tr><td rowspan="10">Beydoun et al. 2014 [<xref ref-type="bibr" rid="CR34">34</xref>
]</td>
<td>Hyperglycemia: FPG ≥100 mg/dL</td>
<td>BPA continuous (log-transformed)</td>
<td>OR = 1.0 (0.9–1.2)</td>
<td rowspan="10">Age, sex, race, education, marital status, smoking status, physical activity, dietary energy intake, urinary creatinine, survey wave</td>
</tr>
<tr><td rowspan="9"></td>
<td rowspan="4">BPA in quartiles (ng/mL): <break></break>
Q1: 0.3 to <1.0; Q2: 1.0 to <2.0; Q3: 2.0 to <3.7; Q4: ≥3.7</td>
<td>Q2 vs. Q1: OR = 0.9 (0.52–1.42)</td>
</tr>
<tr><td>Q3 vs. Q1: OR = 1.2 (0.7–1.9)</td>
</tr>
<tr><td>Q4 vs. Q1: OR = 1.1 (0.6–1.9)</td>
</tr>
<tr><td>p for trend = 0.55</td>
</tr>
<tr><td>Ratio of BPA-to-creatinine continuous (log-transformed)</td>
<td>OR = 1.0 (0.9–1.2)</td>
</tr>
<tr><td rowspan="4">Ratio of BPA-to-creatinine in quartiles:<break></break>
Q1: 0.001 to <0.01; Q2: 0.01 to <0.02; Q3: 0.02 to <0.03; Q4: ≥0.03</td>
<td>Q2 vs. Q1: OR = 1.1 (0.8–1.6)</td>
</tr>
<tr><td>Q3 vs. Q1: OR = 1.3 (0.8–1.9)</td>
</tr>
<tr><td>Q4 vs. Q1: OR = 1.2 (0.8–1.9)</td>
</tr>
<tr><td>p for trend = 0.30</td>
</tr>
<tr><td rowspan="5">Eng et al. 2013 [<xref ref-type="bibr" rid="CR38">38</xref>
]</td>
<td rowspan="5">Abnormal glucose: FPG ≥100 mg/dL</td>
<td>BPA in quartiles (ng/mL)</td>
<td></td>
<td rowspan="5">Age, gender, race/ethnicity, urine creatinine, poverty-to-income ratio, serum cotinine as a marker of smoking status, soda consumption, BMI percentile</td>
</tr>
<tr><td>Q1: <1.3</td>
<td>Q2 vs. Q1: OR = 0.77 (0.33–1.78)</td>
</tr>
<tr><td>Q2: 1.3–2.6</td>
<td>Q3 vs. Q1: OR = 1.32 (0.57–3.04)</td>
</tr>
<tr><td>Q3: 2.6–4.9</td>
<td rowspan="2">Q4 vs. Q1: OR = 0.63 (0.22–1.82)</td>
</tr>
<tr><td>Q4: >4.9</td>
</tr>
</tbody>
</table>
<table-wrap-foot><p><italic>ADA</italic>
American Diabetes Association; <italic>ALT</italic>
alanine aminotransferase; <italic>BMI</italic>
body mass index; <italic>BPA</italic>
bisphenol A; <italic>FPG</italic>
fasting plasma glucose; <italic>HbA1c</italic>
glycated hemoglobin; <italic>HDL</italic>
high density lipoprotein; <italic>hsCRP</italic>
high sensitivity C-reactive protein; NHS Nurses' Health Study; <italic>OR</italic>
odds ratio, <italic>SD</italic>
standard deviation; <italic>T2D</italic>
type 2 diabetes; <italic>TG</italic>
triglycerides; <italic>uBPA</italic>
urinary bisphenol A; <italic>WC</italic>
waist circumference</p>
</table-wrap-foot>
</table-wrap>
<table-wrap id="Tab3"><label>Table 3</label>
<caption><p>Summary of results in studies used as primary data: indicators of anthropometry and adiposity (<italic>n</italic>
= 16 publications)</p>
</caption>
<table frame="hsides" rules="groups"><thead><tr><th>Reference</th>
<th>Outcomes & definitions used</th>
<th>Urinary BPA categorisation</th>
<th>Results</th>
<th>Adjustment in model(s) used for review</th>
</tr>
</thead>
<tbody><tr><td colspan="5">In children</td>
</tr>
<tr><td colspan="5">Prevalent overweight (4 publications)</td>
</tr>
<tr><td rowspan="3">Eng et al. 2013 [<xref ref-type="bibr" rid="CR38">38</xref>
]</td>
<td rowspan="3">Overweight: BMI ≥85th percentile for age/gender</td>
<td rowspan="3">BPA in quartiles (ng/mL): <break></break>
Q1: <1.3; Q2: 1.3–2.6; Q3: 2.6–4.9; Q4: >4.9</td>
<td>Q2 vs. Q1: OR = 1.00 (0.74–1.36)</td>
<td rowspan="3">Age, gender, race/ethnicity, urine creatinine, poverty-to-income ratio, serum cotinine as a marker of smoking status, soda consumption</td>
</tr>
<tr><td>Q3 vs. Q1: OR = 1.17 (0.89–1.54)</td>
</tr>
<tr><td>Q4 vs. Q1: OR = 1.07 (0.80–1.44)</td>
</tr>
<tr><td rowspan="6">Harley et al. 2013 [<xref ref-type="bibr" rid="CR64">64</xref>
]</td>
<td rowspan="6">Overweight: BMI ≥85th percentile at 5 and 9 years of age</td>
<td>Ratio of BPA-to-creatinine level as continuous (log<sub>2</sub>
- transformed) at 5 years</td>
<td>OR = 1.07 (0.90–1.28)</td>
<td rowspan="6">Maternal prepregnancy BMI, household income, maternal education level, maternal years of residence in the United States, child’s environmental tobacco smoke exposure, soda intake, fast food intake, and sweet consumption</td>
</tr>
<tr><td>Ratio of BPA-to-creatinine level in 3 tertiles at 5 years (μg/g):</td>
<td>T2 vs. T1: OR = 0.80 (0.45–1.42)</td>
</tr>
<tr><td>T1: </td>
<td>T3 vs. T1: OR = 1.36 (0.75–2.47)</td>
</tr>
<tr><td>Ratio of BPA-to-creatinine level as continuous (log<sub>2</sub>
- transformed) at 9 years</td>
<td>OR = 1.06 (0.85–1.33)</td>
</tr>
<tr><td>Ratio of BPA-to-creatinine level in 3 groups at 9 years (μg/g):</td>
<td>G2 vs. G1: OR = 3.08 (1.18–8.02)</td>
</tr>
<tr><td>G1: median (1.8–22.5)</td>
<td>G3 vs. G1: OR = 4.20 (1.60–11.02)</td>
</tr>
<tr><td rowspan="8">Li et al. 2013 [<xref ref-type="bibr" rid="CR49">49</xref>
]</td>
<td rowspan="8">Overweight: age- and gender-specific weight >90th percentile of the underlying population</td>
<td rowspan="4">BPA in 2 classes (ng/mL): <break></break>
Low BPA level: <2 (reference); high BPA level: ≥2<break></break>
(2 mg/L is about the median urine BPA level in the U.S. population)</td>
<td>Girls</td>
<td rowspan="8">Age, gender, school, residence, paternal and maternal education and overweight, playing video games, unbalanced diet, eating junk food, vegetables or fruit, depression scores, sports/activities</td>
</tr>
<tr><td>All: OR=1.29 (0.83–2.01)</td>
</tr>
<tr><td>Age 9-12: OR= 2.32 (1.15-4.65)</td>
</tr>
<tr><td>Age>12: OR= 0.90 (0.48-1.72)</td>
</tr>
<tr><td rowspan="4"></td>
<td>Boys</td>
</tr>
<tr><td>All: OR=0.82 (0.55–1.23)</td>
</tr>
<tr><td>Age 9-12: OR= 0.71 (0.34-1.45)</td>
</tr>
<tr><td>Age>12: OR= 0.87 (0.52-1.45)</td>
</tr>
<tr><td rowspan="4">Trasande et al. 2012 [<xref ref-type="bibr" rid="CR47">47</xref>
]</td>
<td rowspan="4">Overweight: BMI z-score ≥1.036 (85th percentile for age/sex)</td>
<td>BPA continuous (log-transformed)</td>
<td>OR = 1.04 (0.92–1.18)</td>
<td rowspan="4">Sex, caloric intake, television watching, poverty to income ratio, parental education, serum cotinine level, urinary creatinine level, age, race/ethnicity categories</td>
</tr>
<tr><td rowspan="3">BPA in quartiles (ng/mL): <break></break>
Q1: ≤1.5; Q2: 1.5–2.7; Q3: 2.8–5.5; Q4: >5.6</td>
<td>Q2 vs. Q1: OR = 1.26 (0.96–1.64)</td>
</tr>
<tr><td>Q3 vs. Q1: OR = 1.28 (0.98–1.66)</td>
</tr>
<tr><td>Q4 vs. Q1: OR = 1.26 (0.86–1.82)</td>
</tr>
<tr><td colspan="5">Prevalent obesity (3 publications)</td>
</tr>
<tr><td rowspan="6">Bhandari et al. 2013 [<xref ref-type="bibr" rid="CR35">35</xref>
]</td>
<td rowspan="6">Obesity: BMI ≥ 95th percentile for age/gender</td>
<td>BPA continuous (log-transformed)</td>
<td>OR = 1.25 (1.09–1.43)</td>
<td>Age, sex, race/ethnicity, education, moderate activity, urinary creatinine, serum cotinine</td>
</tr>
<tr><td rowspan="5">BPA in quartiles (ng/mL): <break></break>
Q1: <1.5; Q2: 1.5–2.7; Q3: 2.8–5.4; Q4: >5.4</td>
<td>Q2 vs. Q1: OR = 2.35 (1.56–3.53)</td>
<td rowspan="5"></td>
</tr>
<tr><td>Q3 vs. Q1: OR = 1.78 (1.13–2.79)</td>
</tr>
<tr><td>Q4 vs. Q1: OR = 2.55 (1.65–3.95)</td>
</tr>
<tr><td>p for trend = 0.002</td>
</tr>
<tr><td>Stratified analyses by sex (p for interaction = 0.07): association of strong magnitude and statistically significant among boys</td>
</tr>
<tr><td rowspan="3">Eng et al. 2013 [<xref ref-type="bibr" rid="CR38">38</xref>
]</td>
<td rowspan="3">Obesity: BMI ≥95th percentile for age/gender</td>
<td rowspan="3">BPA in quartiles (ng/mL): <break></break>
Q1: <1.3; Q2: 1.3–2.6; Q3: 2.6–4.9; Q4: >4.9</td>
<td>Q2 vs. Q1: OR = 1.73 (1.16–2.58)</td>
<td rowspan="3">Age, gender, race/ethnicity, urine creatinine, poverty-to-income ratio, serum cotinine as a marker of smoking status, soda consumption</td>
</tr>
<tr><td>Q3 vs. Q1: OR = 1.63 (1.08–2.46)</td>
</tr>
<tr><td>Q4 vs. Q1: OR = 2.05 (1.38–3.04)</td>
</tr>
<tr><td rowspan="4">Trasande et al. 2012 [<xref ref-type="bibr" rid="CR47">47</xref>
]</td>
<td rowspan="4">Obesity: BMI z-score ≥1.64 (95th percentile for age/sex)</td>
<td>BPA continuous (log-transformed)</td>
<td>Continuous: OR = 1.24 (1.08–1.44)</td>
<td rowspan="4">Sex, caloric intake, television watching, poverty-to-income ratio, parental education, serum cotinine level, urinary creatinine level, age, race/ethnicity categories</td>
</tr>
<tr><td rowspan="3">BPA in quartiles (ng/mL): <break></break>
Q1: ≤1.5; Q2: 1.5–2.7; Q3: 2.8–5.5; Q4: >5.6</td>
<td>Q2 vs. Q1: OR = 2.24 (1.54–3.24)</td>
</tr>
<tr><td>Q3 vs. Q1: OR = 2.08 (1.46–2.96)</td>
</tr>
<tr><td>Q4 vs. Q1: OR = 2.57 (1.72–3.83)</td>
</tr>
<tr><td colspan="5">Prevalent elevated waist circumference</td>
</tr>
<tr><td rowspan="8">Eng et al. 2013 [<xref ref-type="bibr" rid="CR38">38</xref>
]</td>
<td rowspan="8">Abnormal WC: WC ≥90th percentile for age/gender<break></break>
Abnormal WC-to-height ratio: WC-to-height ratio ≥0.5</td>
<td rowspan="8">BPA in quartiles (ng/mL): <break></break>
Q1: <1.3; Q2: 1.3–2.6; Q3: 2.6–4.9; Q4: >4.9</td>
<td>Abnormal WC</td>
<td rowspan="8">Age, gender, race/ethnicity, urine creatinine, poverty-to-income ratio, serum cotinine as a marker of smoking status, soda consumption</td>
</tr>
<tr><td>Q2 vs. Q1: OR = 1.33 (0.90–1.97)</td>
</tr>
<tr><td>Q3 vs. Q1: OR = 1.16 (0.75–1.81)</td>
</tr>
<tr><td>Q4 vs. Q1: OR = 1.40 (0.91–2.15)</td>
</tr>
<tr><td>Abnormal WC-to-height ratio</td>
</tr>
<tr><td>Q2 vs. Q1: OR = 1.37 (0.97–1.92)</td>
</tr>
<tr><td>Q3 vs. Q1: OR = 1.41 (1.07–1.87)</td>
</tr>
<tr><td>Q4 vs. Q1: OR = 1.56 (1.11–2.17)</td>
</tr>
<tr><td colspan="5">Other</td>
</tr>
<tr><td rowspan="3">Braun et al. 2014 [<xref ref-type="bibr" rid="CR63">63</xref>
]</td>
<td rowspan="3">Change in BMI z-score between 2 and 5 years of age, as continuous</td>
<td>Ratio of BPA-to-creatinine continuous (log<sub>10</sub>
-transformed)</td>
<td>Per 10-fold increase:<break></break>
β = −0.2 (−0.6, 0.1)</td>
<td rowspan="3">Maternal race, marital status, parity, age at delivery, household income, education, employment, insurance, BMI at 16 weeks of pregnancy, depressive symptoms at baseline, prenatal serum cotinine</td>
</tr>
<tr><td>Ratio of BPA-to-creatinine in tertiles (μg/g creatinine):</td>
<td>T2 vs. T1: β = 0.0 (−0.3, 0.3)</td>
</tr>
<tr><td>T1: 2.1–11; T2: 11–20; T3: 20–314</td>
<td>T3 vs. T1: β = −0.2 (−0.5, 0.1)</td>
</tr>
<tr><td rowspan="3">Eng et al. 2013 [<xref ref-type="bibr" rid="CR38">38</xref>
]</td>
<td rowspan="3">Prevalent abnormal body fat: body fat ≥85th percentile for age/gender</td>
<td rowspan="3">BPA in quartiles (ng/mL): <break></break>
Q1: <1.3; Q2: 1.3–2.6; Q3: 2.6–4.9; Q4: >4.9</td>
<td>Q2 vs. Q1: OR = 4.85 (0.80–21.4)</td>
<td rowspan="3">Age, gender, race/ethnicity, urine creatinine, poverty-to-income ratio, serum cotinine as a marker of smoking status, soda consumption</td>
</tr>
<tr><td>Q3 vs. Q1: OR = 5.36 (0.71–43.3)</td>
</tr>
<tr><td>Q4 vs. Q1: OR = 2.10 (0.24–17.8)</td>
</tr>
<tr><td rowspan="3">Harley et al. 2013 [<xref ref-type="bibr" rid="CR64">64</xref>
]</td>
<td rowspan="3">Incident overweight: BMI ≥85th percentile at 9 years of age</td>
<td>Ratio of BPA-to-creatinine level at 5 years as continuous (log<sub>2</sub>
- transformed)</td>
<td>OR = 1.02 (0.84–1.23)</td>
<td rowspan="3">Maternal prepregnancy BMI, household income, maternal education level, maternal years of residence in the United States, child’s environmental tobacco smoke exposure, soda intake, fast food intake, and sweet consumption at age 5 years</td>
</tr>
<tr><td>Ratio of BPA-to-creatinine level at 5 years in tertiles (μg/g):</td>
<td>T2 vs. T1: 0.91 (0.48–1.73)</td>
</tr>
<tr><td>T1: </td>
<td>T3 vs. T1: 1.28 (0.65–2.51)</td>
</tr>
<tr><td>Wang et al. 2012b [<xref ref-type="bibr" rid="CR50">50</xref>
]</td>
<td>Prevalent BMI as continuous (kg/m<sup>2</sup>
)</td>
<td>BPA continuous (log-transformed and corrected for specific gravity)</td>
<td>β = 0.017 (0.002–0.032)</td>
<td>Age, sex</td>
</tr>
<tr><td rowspan="5">Wells et al. 2013 [<xref ref-type="bibr" rid="CR48">48</xref>
]</td>
<td rowspan="5">Prevalent waist-to-height ratio as continuous</td>
<td rowspan="5">BPA in quartiles (ng/mL): <break></break>
Q1: <1.2; Q2: 1.2–2.6; Q3: 2.6–5.1; Q4: >5.1</td>
<td>Change in waist-to-height ratio:</td>
<td rowspan="5">Urinary creatinine, age, sex, race/ethnicity, education, smoking status based on serum cotinine, caloric intake</td>
</tr>
<tr><td>Q2 vs. Q1: β = 0.011 (0.001–0.020)</td>
</tr>
<tr><td>Q3 vs. Q1: β = 0.010 (0.001–0.019)</td>
</tr>
<tr><td>Q4 vs. Q1: β = 0.016 (0.007–0.026)</td>
</tr>
<tr><td>Significant associations among boys but not girls.</td>
</tr>
<tr><td colspan="5">In adults</td>
</tr>
<tr><td colspan="5">Prevalent overweight (3 publications)</td>
</tr>
<tr><td rowspan="3">Carwile & Michels 2011 [<xref ref-type="bibr" rid="CR36">36</xref>
]</td>
<td rowspan="3">Overweight: 25 ≤ BMI < 30 kg/m<sup>2</sup>
(reference: BMI <25 kg/m<sup>2</sup>
)</td>
<td rowspan="3">BPA in quartiles (ng/mL): <break></break>
Q1: ≤1.1; Q2: 1.2–2.3; Q3: 2.4–4.6; Q4: ≥4.7</td>
<td>Q2 vs. Q1: OR = 1.66 (1.21–2.27)</td>
<td rowspan="3">Age, gender, race/ethnicity, education, smoking status, urinary creatinine</td>
</tr>
<tr><td>Q3 vs. Q1: OR = 1.26 (0.85–1.87)</td>
</tr>
<tr><td>Q4 vs. Q1: OR = 1.31 (0.80–2.14)</td>
</tr>
<tr><td>Kim et al. 2011 [<xref ref-type="bibr" rid="CR55">55</xref>
]</td>
<td>Overweight: BMI = 23-24.9 kg/m<sup>2</sup>
, according to the WHO definitions for the Asian populations (reference: BMI <18.5 kg/m<sup>2</sup>
)</td>
<td>BPA continuous (log-transformed)</td>
<td>Adjusted proportional change (95 % CI) = 1.01 (0.78–1.31)</td>
<td>Age, gender, education, income, cigarette smoking status, place of residence, urinary creatinine</td>
</tr>
<tr><td rowspan="3">Wang et al. 2012a [<xref ref-type="bibr" rid="CR52">52</xref>
]</td>
<td rowspan="3">Generalized overweight: 24 ≤ BMI < 28 kg/m<sup>2</sup>
, according to Chinese criteria (reference = BMI <24 kg/m<sup>2</sup>
)</td>
<td rowspan="3">BPA in quartiles (ng/mL): <break></break>
Q1: ≤0.47; Q2: 0.48–0.81; Q3: 0.82–1.43; Q4: >1.43</td>
<td>Q2 vs. Q1: OR = 1.23 (0.97–1.57)</td>
<td rowspan="3">Age, sex, urinary creatinine, smoking, alcohol drinking, education levels, systolic blood pressure, HDL cholesterol, LDL cholesterol, total cholesterol, TG, hsCRP, fasting plasma glucose, fasting serum insulin, serum ALT and GGT</td>
</tr>
<tr><td>Q3 vs. Q1: OR = 1.28 (1.01–1.63)</td>
</tr>
<tr><td>Q4 vs. Q1: OR = 1.24 (0.97–1.59)</td>
</tr>
<tr><td colspan="5">Prevalent obesity (4 publications)</td>
</tr>
<tr><td rowspan="3">Carwile & Michels 2011 [<xref ref-type="bibr" rid="CR36">36</xref>
]</td>
<td rowspan="3">Obesity: BMI ≥30 kg/m<sup>2</sup>
(reference: BMI <25 kg/m<sup>2</sup>
)</td>
<td rowspan="3">BPA in quartiles (ng/mL): <break></break>
Q1: ≤1.1; Q2: 1.2–2.3; Q3: 2.4–4.6; Q4: ≥4.7</td>
<td>Q2 vs. Q1: OR = 1.85 (1.22–2.79)</td>
<td rowspan="3">Age, gender, race/ethnicity, education, smoking status, urinary creatinine</td>
</tr>
<tr><td>Q3 vs. Q1: OR = 1.60 (1.05–2.44)</td>
</tr>
<tr><td>Q4 vs. Q1: OR = 1.76 (1.06–2.94)</td>
</tr>
<tr><td>Kim et al. 2011 [<xref ref-type="bibr" rid="CR55">55</xref>
]</td>
<td>Obesity: BMI ≥25 kg/m<sup>2</sup>
, according to the WHO definitions for the Asian populations (reference = BMI <18.5 kg/m<sup>2</sup>
)</td>
<td>BPA continuous (log-transformed)</td>
<td>Adjusted proportional change (95 % CI) = 0.96 (0.75–1.23)</td>
<td>Age, gender, education, income, cigarette smoking status, place of residence, urinary creatinine</td>
</tr>
<tr><td rowspan="5">Shankar et al. 2012 [<xref ref-type="bibr" rid="CR44">44</xref>
]</td>
<td rowspan="5">Obesity: BMI ≥30 kg/m<sup>2</sup>
(reference = BMI <30 kg/m<sup>2</sup>
)</td>
<td rowspan="5">BPA in quartiles (ng/mL): <break></break>
Q1: <1.10; Q2: 1.10–2.10; Q3: 2.11–4.20; Q4: >4.20</td>
<td>Q2 vs. Q1: OR = 1.40 (1.10–1.76)</td>
<td rowspan="5">Age, gender, race/ethnicity, education categories, smoking, alcohol consumption, physical inactivity, diabetes, hypertension, total cholesterol</td>
</tr>
<tr><td>Q3 vs. Q1: OR = 1.59 (1.25–2.02)</td>
</tr>
<tr><td>Q4 vs. Q1: OR = 1.69 (1.30–2.20)</td>
</tr>
<tr><td>p for trend < 0.0001</td>
</tr>
<tr><td>Associations still significant in analyses stratified by sex.</td>
</tr>
<tr><td rowspan="3">Wang et al. 2012a [<xref ref-type="bibr" rid="CR52">52</xref>
]</td>
<td rowspan="3">Generalized obesity: BMI ≥28 kg/m<sup>2</sup>
, according to Chinese criteria (reference: BMI <28 kg/m<sup>2</sup>
)</td>
<td rowspan="3">BPA in quartiles (ng/mL): <break></break>
Q1: ≤0.47; Q2: 0.48–0.81; Q3: 0.82–1.43; Q4: >1.43</td>
<td>Q2 vs. Q1: OR = 1.14 (0.87–1.50)</td>
<td rowspan="3">Age, sex, urinary creatinine, smoking, alcohol drinking, education levels, systolic blood pressure, HDL cholesterol, LDL cholesterol, total cholesterol, TG, hsCRP, fasting plasma glucose, fasting serum insulin, serum ALT and GGT</td>
</tr>
<tr><td>Q3 vs. Q1: OR = 1.19 (0.90–1.57)</td>
</tr>
<tr><td>Q4 vs. Q1: OR = 1.50 (1.15–1.97)</td>
</tr>
<tr><td colspan="5">Prevalent elevated waist circumference (4 publications)</td>
</tr>
<tr><td rowspan="3">Carwile & Michels 2011 [<xref ref-type="bibr" rid="CR36">36</xref>
]</td>
<td rowspan="3">Elevated WC: WC ≥102 cm in men and WC ≥88 cm in women</td>
<td rowspan="3">BPA in quartiles (ng/mL): <break></break>
Q1: ≤1.1; Q2: 1.2–2.3; Q3: 2.4–4.6; Q4: ≥4.7</td>
<td>Q2 vs. Q1: OR = 1.62 (1.11–2.36)</td>
<td rowspan="3">Age, gender, race/ethnicity, education, smoking status, urinary creatinine</td>
</tr>
<tr><td>Q3 vs. Q1: OR = 1.39 (1.02–1.90)</td>
</tr>
<tr><td>Q4 vs. Q4: OR = 1.58 (1.03–2.42)</td>
</tr>
<tr><td rowspan="4">Ko et al. 2014 [<xref ref-type="bibr" rid="CR57">57</xref>
]</td>
<td rowspan="4">Abdominal obesity: WC ≥90 cm in men and WC ≥85 cm in women</td>
<td rowspan="4">BPA in quartiles (μg/mL)<break></break>
Q1: <0.853; Q2: 0.853–1.407; Q3: 1.407–2.594; Q4: >2.594</td>
<td>Q2 vs. Q1: 1.117 (0.757–1.649)</td>
<td rowspan="4">Age, sex, urinary creatinine, education, income, alcohol consumption, smoking status</td>
</tr>
<tr><td>Q3 vs. Q1: 1.337 (0.908–1.967)</td>
</tr>
<tr><td>Q4 vs. Q1: 1.938 (1.314–2.857)</td>
</tr>
<tr><td>p for trend = 0.01</td>
</tr>
<tr><td rowspan="5">Shankar et al. 2012 [<xref ref-type="bibr" rid="CR44">44</xref>
]</td>
<td rowspan="5">Abdominal obesity: WC ≥102 cm in men and WC ≥88 cm in women</td>
<td rowspan="5">BPA in quartiles (ng/mL):<break></break>
Q1: <1.10; Q2: 1.10–2.10; Q3: 2.11–4.20; Q4: >4.20</td>
<td>Q2 vs. Q1: OR = 1.63 (1.20–2.22)</td>
<td rowspan="5">Age, gender, race/ethnicity, education categories, smoking, alcohol consumption, physical inactivity, diabetes, hypertension, total cholesterol</td>
</tr>
<tr><td>Q3 vs. Q1: OR = 1.66 (1.28–2.14)</td>
</tr>
<tr><td>Q4 vs. Q1: OR = 1.59 (1.21–2.09)</td>
</tr>
<tr><td>p for trend = 0.0009</td>
</tr>
<tr><td>Associations still significant in analyses stratified by sex</td>
</tr>
<tr><td rowspan="3">Wang et al. 2012a [<xref ref-type="bibr" rid="CR52">52</xref>
]</td>
<td rowspan="3">Abdominal obesity: WC ≥90 cm in men and WC ≥85 cm in women</td>
<td rowspan="3">BPA in quartiles (ng/mL): <break></break>
Q1: ≤0.47; Q2: 0.48–0.81; Q3: 0.82–1.43; Q4: >1.43</td>
<td>Q2 vs. Q1: OR = 1.26 (1.02–1.57)</td>
<td rowspan="3">Age, sex, urinary creatinine, smoking, alcohol drinking, education levels, systolic blood pressure, HDL cholesterol, LDL cholesterol, total cholesterol, TG, hsCRP, fasting plasma glucose, fasting serum insulin, serum ALT and GGT</td>
</tr>
<tr><td>Q3 vs. Q1: OR = 1.28 (1.03–1.59)</td>
</tr>
<tr><td>Q4 vs. Q1: OR = 1.28 (1.03–1.60)</td>
</tr>
<tr><td colspan="5">Other</td>
</tr>
<tr><td rowspan="2">Galloway et al. 2010 [<xref ref-type="bibr" rid="CR58">58</xref>
]</td>
<td rowspan="2">Prevalent WC as continuous<break></break>
Prevalent weight as continuous</td>
<td rowspan="2">Daily BPA excretion (μg/day) as a continuous variable</td>
<td>WC: β = 0.0062 (0.0016–0.0108)</td>
<td rowspan="2">Age, sex, study site</td>
</tr>
<tr><td>Weight: β = 0.0064 (0.0023–0.0104)</td>
</tr>
<tr><td>Kim et al. 2011 [<xref ref-type="bibr" rid="CR55">55</xref>
]</td>
<td>Prevalent normal weight: BMI = 18.5–22.9 kg/m<sup>2</sup>
, according to the WHO definitions for the Asian populations (reference: BMI < 18.5 kg/m<sup>2</sup>
)</td>
<td>BPA continuous (log-transformed)</td>
<td>Adjusted proportional change (95 % CI) = 0.92 (0.72–1.17)</td>
<td>Age, gender, education, income, cigarette smoking status, place of residence, urinary creatinine</td>
</tr>
<tr><td rowspan="5">Song et al. 2014 [<xref ref-type="bibr" rid="CR62">62</xref>
]</td>
<td rowspan="5">Weight change rate (WCR) during follow-up (kg/year)</td>
<td>BPA in quartiles (nmol/L):</td>
<td></td>
<td rowspan="5">Age at baseline, urinary creatinine concentration, cohort origin, menopausal status, smoking, alcohol consumption, physical activity, alternative healthy eating index, total energy intake</td>
</tr>
<tr><td>Q1: median (IQR) = 3.6 (2.6–4.5)</td>
<td>Q2 vs. Q1: WCR = 0.15 (0.00–0.31)</td>
</tr>
<tr><td>Q2: median (IQR) = 6.4 (5.8–7.3)</td>
<td>Q3 vs. Q1: WCR = 0.18 (0.03–0.34)</td>
</tr>
<tr><td>Q3: median (IQR) = 10.5 (9.0–12.1)</td>
<td>Q4 vs. Q1: WCR = 0.23 (0.07–0.38)</td>
</tr>
<tr><td>Q4: median (IQR) = 21.9 (16.8–35.7)</td>
<td>p for trend = 0.02</td>
</tr>
<tr><td rowspan="8">Zhao et al. 2012 [<xref ref-type="bibr" rid="CR53">53</xref>
]</td>
<td rowspan="8">Fat mass, fat-free mass, body weight, BMI, WC, hip circumference, waist-hip ratio (all variables as continuous)</td>
<td rowspan="8">BPA continuous</td>
<td>Fat mass: r = 0.35 (p < 0.001)</td>
<td rowspan="8">Age</td>
</tr>
<tr><td>Fat-free mass: r = 0.186 (p = 0.009)</td>
</tr>
<tr><td>Body weight: r = 0.24 (p = 0.001)</td>
</tr>
<tr><td>BMI: r = 0.298 (p < 0.001)</td>
</tr>
<tr><td>WC: r = 0.296 (p < 0.001)</td>
</tr>
<tr><td>Hip circumference: r = 0.27 (p < 0.001)</td>
</tr>
<tr><td>Waist-hip ratio: r = 0.149 (p = 0.035)</td>
</tr>
<tr><td>With additional adjustment for age and BMI, BPA was still significantly associated with fat mass (r = 0.193, p = 0.006) but not with fat-free mass.</td>
</tr>
</tbody>
</table>
<table-wrap-foot><p><italic>ALT</italic>
alanine aminotransferase; <italic>BMI</italic>
body mass index; <italic>BPA</italic>
bisphenol A; <italic>GGT</italic>
gamma glutamyltransferase; <italic>HDL</italic>
high density lipoprotein; <italic>hsCRP</italic>
high sensitivity C-reactive protein; <italic>IQR</italic>
interquartile range; <italic>LDL</italic>
low density lipoprotein; <italic>LOD</italic>
limit of detection; <italic>OR</italic>
odds ratio; <italic>TG</italic>
triglycerides; <italic>WC</italic>
waist circumference; <italic>WCR</italic>
weight change rate</p>
</table-wrap-foot>
</table-wrap>
<table-wrap id="Tab4"><label>Table 4</label>
<caption><p>Summary of results in studies used as primary data: cardiovascular disease and hypertension (<italic>n</italic>
= 9 publications)</p>
</caption>
<table frame="hsides" rules="groups"><thead><tr><th>Reference</th>
<th>Outcomes & definitions used</th>
<th>Urinary BPA categorisation</th>
<th>Results</th>
<th>Adjustment in model(s) used for review</th>
</tr>
</thead>
<tbody><tr><td colspan="5">Prevalent CVD (5 publications)</td>
</tr>
<tr><td rowspan="14">Casey & Neidell 2013 [<xref ref-type="bibr" rid="CR37">37</xref>
]</td>
<td rowspan="14">CHD: self-report of doctor diagnosis</td>
<td rowspan="5">BPA continuous (not log-transformed)</td>
<td>Per SD increase:</td>
<td rowspan="14">Age, sex, urinary creatinine concentration, race/ethnicity, income, smoking, body mass index, waist circumference, veteran/military status, citizenship status, marital status, household size, pregnancy status, language at subject interview, health insurance coverage, employment status in the prior week, consumption of bottled water in the past 24 h, consumption of alcohol, annual consumption of tuna fish, presence of emotional support in one’s life, being on a diet, using a water treatment device, access to a routine source of health care, vaccinated for Hepatitis A or B, consumption of dietary supplements (vitamins or minerals), inability to purchase balanced meals on a consistent basis + survey cycle for pooled analyses</td>
</tr>
<tr><td>2003/04: OR = 1.824 (1.288–2.583)</td>
</tr>
<tr><td>2005/06: OR = 1.267 (1.041–1.542)</td>
</tr>
<tr><td>2007/08: OR = 1.123 (0.854–1.476)</td>
</tr>
<tr><td>Pooled 2003/08: OR = 1.136 (1.014–1.273)</td>
</tr>
<tr><td rowspan="5">BPA continuous (log-transformed)</td>
<td>Per 10-fold increase:</td>
</tr>
<tr><td>2003/04: OR = 1.584 (1.066–2.354)</td>
</tr>
<tr><td>2005/06: OR = 1.178 (0.765–1.815)</td>
</tr>
<tr><td>2007/08: OR = 1.649 (1.025–2.654)</td>
</tr>
<tr><td>Pooled 2003/08: OR = 1.280 (0.993–1.649)</td>
</tr>
<tr><td rowspan="4">BPA in quartiles (ng/mL):<break></break>
Q1: <1.2; Q2: 1.2–2.2; Q3: 2.3–4.2; Q4: >4.2</td>
<td>Pooled 2003/08:</td>
</tr>
<tr><td>Q2 vs. Q1: 0.520 (0.250–1.084)</td>
</tr>
<tr><td>Q3 vs. Q1: 1.006 (0.508–1.994)</td>
</tr>
<tr><td>Q4 vs. Q1: 1.520 (0.774–2.987)</td>
</tr>
<tr><td rowspan="12">Lakind et al. 2012 [<xref ref-type="bibr" rid="CR33">33</xref>
]</td>
<td rowspan="12">CHD: self-report of doctor diagnosis<break></break>
Heart attack: self-report of doctor diagnosis</td>
<td rowspan="12">BPA continuous</td>
<td>CHD, per unit increase:</td>
<td rowspan="6">Age, gender, ethnicity, education, income, smoking, heavy drinking, BMI, waist circumference, energy intake, family history of heart attack, hypertension, sedentary activity, total cholesterol, urinary creatinine. <break></break>
Pooled 2003/10 models were further adjusted for survey cycle, but were not adjusted for energy intake and sedentary activity.</td>
</tr>
<tr><td>2003/04: OR = 1.03 (0.978–1.09)</td>
</tr>
<tr><td>2005/06: OR = 1.02 (0.996–1.04)</td>
</tr>
<tr><td>2007/08: OR = 0.996 (0.951–1.04)</td>
</tr>
<tr><td>2009/10: OR = 1.00 (0.998–1.01)</td>
</tr>
<tr><td>Pooled 2003/10: OR = 1.004 (0.998–1.009)</td>
</tr>
<tr><td>Heart attack, per unit increase:</td>
<td rowspan="6"></td>
</tr>
<tr><td>2003/04: OR = 1.04 (0.996–1.09)</td>
</tr>
<tr><td>2005/06: OR = 1.02 (0.996–1.04)</td>
</tr>
<tr><td>2007/08: OR = 0.987 (0.941–1.04)</td>
</tr>
<tr><td>2009/10: OR = 1.00 (0.999–1.01)</td>
</tr>
<tr><td>Pooled 2003/10: OR = 1.002 (0.998–1.007)</td>
</tr>
<tr><td rowspan="6">Lang et al. 2008 [<xref ref-type="bibr" rid="CR39">39</xref>
]</td>
<td rowspan="6">Heart attack, angina, CHD, CVD (any diagnoses of MI, angina or CHD), stroke; all self-reported doctor diagnoses</td>
<td rowspan="6">BPA continuous</td>
<td>Per SD increase:</td>
<td rowspan="6">Age, gender, race/ethnicity, education, income, BMI, WC, smoking status, urinary creatinine</td>
</tr>
<tr><td>Heart attack: OR = 1.40 (1.11–1.78),</td>
</tr>
<tr><td>Angina: OR = 1.28 (1.09–1.50)</td>
</tr>
<tr><td>CHD: OR = 1.63 (1.18–2.26)</td>
</tr>
<tr><td>CVD: OR = 1.39 (1.18–1.63)</td>
</tr>
<tr><td>Stroke: OR = 0.97 (0.74–1.27)</td>
</tr>
<tr><td rowspan="4">Melzer et al. 2010 [<xref ref-type="bibr" rid="CR40">40</xref>
]</td>
<td rowspan="4">MI, angina, CHD, CVD (any diagnoses of MI, angina or CHD); all self-reported doctor diagnoses</td>
<td rowspan="4">BPA continuous</td>
<td>MI, per SD increase:</td>
<td rowspan="4">Age, gender, ethnicity, education, income, BMI, WC, smoking status, urinary creatinine</td>
</tr>
<tr><td>2003/04: OR = 1.40 (1.07–1.84)</td>
</tr>
<tr><td>2005/06: OR = 1.39 (1.00–1.94)</td>
</tr>
<tr><td>Pooled 2003/06: OR = 1.32 (1.15–1.52)</td>
</tr>
<tr><td rowspan="12"></td>
<td rowspan="12"></td>
<td rowspan="12"></td>
<td>Angina, per SD increase:</td>
<td rowspan="4"></td>
</tr>
<tr><td>2003/04: OR = 1.27 (1.06–1.54)</td>
</tr>
<tr><td>2005/06: OR = 1.16 (0.88–1.53)</td>
</tr>
<tr><td>Pooled 2003/06: OR = 1.24 (1.07-1.43)</td>
</tr>
<tr><td>CHD, per SD increase:</td>
<td rowspan="4"></td>
</tr>
<tr><td>2003/04: OR = 1.60 (1.11–2.32)</td>
</tr>
<tr><td>2005/06: OR = 1.33 (1.01–1.75)</td>
</tr>
<tr><td>Pooled 2003/06: OR = 1.42 (1.17–1.72)</td>
</tr>
<tr><td>CVD, per SD increase:</td>
<td rowspan="4"></td>
</tr>
<tr><td>2003/04: OR = 1.34 (1.10–1.66)</td>
</tr>
<tr><td>2005/06: OR = 1.18 (0.88–1.59)</td>
</tr>
<tr><td>Pooled 2003/06: OR = 1.26 (1.11–1.44)</td>
</tr>
<tr><td rowspan="3">Melzer et al. 2012b [<xref ref-type="bibr" rid="CR59">59</xref>
]</td>
<td rowspan="3">CAD: no, intermediate, severe (assessed by angiography)</td>
<td rowspan="3">BPA continuous</td>
<td>Per SD increase:</td>
<td rowspan="3">Age, sex, BMI category, occupational social class, diabetes status</td>
</tr>
<tr><td>Intermediate vs. no CAD: OR = 1.69 (0.98–2.94)</td>
</tr>
<tr><td>Severe vs. no CAD: OR = 1.43 (1.03–1.98)</td>
</tr>
<tr><td colspan="5">Incident CVD (1 publication)</td>
</tr>
<tr><td rowspan="2">Melzer et al. 2012a [<xref ref-type="bibr" rid="CR60">60</xref>
]</td>
<td rowspan="2">Incident CAD during follow-up: recorded hospital admission and/or died with CAD as underlying cause</td>
<td rowspan="2">BPA continuous</td>
<td>Per SD increase:</td>
<td rowspan="2">Age, sex, urinary creatinine, education level, occupational group, BMI, cigarette smoking, average of the 2 systolic BP readings, total cholesterol, LDL cholesterol, HDL cholesterol, TG, level of physical activity</td>
</tr>
<tr><td>OR = 1.11 (1.00–1.23)</td>
</tr>
<tr><td colspan="5">Prevalent hypertension (3 studies)</td>
</tr>
<tr><td rowspan="9">Bae et al. 2012 [<xref ref-type="bibr" rid="CR54">54</xref>
]</td>
<td rowspan="9">Hypertension: systolic BP ≥140 mm Hg or diastolic BP ≥90 mm Hg</td>
<td rowspan="9">Ratio of BPA-to-creatinine in quartiles (μg/g creatinine): <break></break>
Q1: <0.37; Q2: 0.37–0.73; Q3: 0.73–1.33; Q4: >1.33</td>
<td>All participants:</td>
<td rowspan="9">Age, sex, height, weight, date of examination, mean fasting blood glucose, smoking status, current consumption of alcohol</td>
</tr>
<tr><td>Q2 vs. Q1: OR = 1.21 (0.80–1.84)</td>
</tr>
<tr><td>Q3 vs. Q1: OR = 1.16 (0.78–1.72)</td>
</tr>
<tr><td>Q4 vs. Q1: OR = 1.27 (0.85–1.88)</td>
</tr>
<tr><td>Stratification by gender: non-significant results in males and females.</td>
</tr>
<tr><td>Significant associations in participants without previous history of hypertension</td>
</tr>
<tr><td>Q2 vs. Q1: OR = 2.23 (1.21–4.12)</td>
</tr>
<tr><td>Q3 vs. Q1: OR = 1.79 (1.01–3.17)</td>
</tr>
<tr><td>Q4 vs. Q1: OR = 2.35 (1.33–4.17)</td>
</tr>
<tr><td rowspan="4">Shankar & Teppala 2012 [<xref ref-type="bibr" rid="CR43">43</xref>
]</td>
<td rowspan="4">Hypertension: current blood-pressure-reducing medication use and/or systolic BP >140 mmHg and/or diastolic BP >90 mm Hg</td>
<td>BPA continuous (log-transformed)</td>
<td>OR = 1.11 (1.01–1.22)</td>
<td rowspan="4">Age, sex, race/ethnicity, education categories, smoking, alcohol intake, BMI, diabetes, total cholesterol</td>
</tr>
<tr><td rowspan="3">BPA in tertiles (ng/mL): <break></break>
T1: <1.5; T2: 1.5–4.0; T3: >4.0</td>
<td>T2 vs. T1: OR = 1.11 (0.71–1.74)</td>
</tr>
<tr><td>T3 vs. T1: OR = 1.50 (1.12–2.00)</td>
</tr>
<tr><td>p for trend = 0.007</td>
</tr>
<tr><td rowspan="2">Shiue et al. 2014 [<xref ref-type="bibr" rid="CR45">45</xref>
]</td>
<td rowspan="2">High BP: systolic BP ≥140 mmHg and diastolic BP ≥90 mmHg</td>
<td rowspan="2">BPA continuous (log-transformed)</td>
<td>Adjusted model: OR = 1.14 (1.00–1.30)</td>
<td rowspan="2">Urinary creatinine, age at examination, sex, ethnicity, BMI</td>
</tr>
<tr><td>Weighted model (additionally adjusted for subsample weighting): OR = 1.12 (0.93–1.35)</td>
</tr>
</tbody>
</table>
<table-wrap-foot><p><italic>BMI</italic>
body mass index; <italic>BP</italic>
blood pressure; <italic>BPA</italic>
bisphenol A; <italic>CAD</italic>
coronary artery disease; <italic>CHD</italic>
coronary heart disease; <italic>CVD</italic>
cardiovascular disease; <italic>HDL</italic>
high density lipoprotein; <italic>LDL</italic>
low density lipoprotein; <italic>MI</italic>
myocardial infraction; <italic>OR</italic>
odds ratio; <italic>SD</italic>
: standard deviation; <italic>TG</italic>
triglycerides; <italic>WC</italic>
waist circumference</p>
</table-wrap-foot>
</table-wrap>
</p>
<p>All studies except 8 [<xref ref-type="bibr" rid="CR32">32</xref>
, <xref ref-type="bibr" rid="CR45">45</xref>
, <xref ref-type="bibr" rid="CR50">50</xref>
, <xref ref-type="bibr" rid="CR53">53</xref>
, <xref ref-type="bibr" rid="CR54">54</xref>
, <xref ref-type="bibr" rid="CR58">58</xref>
, <xref ref-type="bibr" rid="CR61">61</xref>
, <xref ref-type="bibr" rid="CR62">62</xref>
] adjusted their statistical models for socioeconomic variables (e.g., education, income, occupation). All U.S. studies were adjusted for race/ethnicity.</p>
<p>Ten out of 33 studies (30 %) adjusted their models for dietary intake such as total energy intake [<xref ref-type="bibr" rid="CR33">33</xref>
, <xref ref-type="bibr" rid="CR34">34</xref>
, <xref ref-type="bibr" rid="CR47">47</xref>
, <xref ref-type="bibr" rid="CR48">48</xref>
, <xref ref-type="bibr" rid="CR62">62</xref>
], sugar-sweetened soda consumption [<xref ref-type="bibr" rid="CR38">38</xref>
, <xref ref-type="bibr" rid="CR64">64</xref>
], ‘healthy’ food consumption [<xref ref-type="bibr" rid="CR49">49</xref>
, <xref ref-type="bibr" rid="CR61">61</xref>
, <xref ref-type="bibr" rid="CR62">62</xref>
] or unbalanced diet (e.g., fast food or sweet consumption) [<xref ref-type="bibr" rid="CR49">49</xref>
, <xref ref-type="bibr" rid="CR64">64</xref>
]. Casey & Neidell adjusted for potential BPA sources including consumption of bottled water and canned tuna [<xref ref-type="bibr" rid="CR37">37</xref>
].</p>
</sec>
<sec id="Sec14"><title>Quality of individual studies</title>
<p>Detailed results of the quality assessment of individual studies according to our scoring system are reported in the Additional file <xref rid="MOESM1" ref-type="media">1</xref>
: Table S4. In summary, there were 4 (12 %) studies scored as ‘high-quality’, 27 (82 %) scored as ‘medium-quality’ and 2 (6 %) scored as ‘low-quality’. All ‘high-quality’ studies were longitudinal [<xref ref-type="bibr" rid="CR60">60</xref>
, <xref ref-type="bibr" rid="CR61">61</xref>
, <xref ref-type="bibr" rid="CR63">63</xref>
, <xref ref-type="bibr" rid="CR64">64</xref>
]. Results reported in these ‘high-quality’ studies were mixed or significant. Significant and non-significant results were also reported in ‘medium quality’ and ‘low quality’ studies.</p>
</sec>
</sec>
<sec id="Sec15"><title>Diabetes and hyperglycemia</title>
<sec id="Sec16"><title>Diabetes</title>
<p>Eight cross-sectional studies reported on the relation between uBPA and diabetes [<xref ref-type="bibr" rid="CR32">32</xref>
, <xref ref-type="bibr" rid="CR37">37</xref>
, <xref ref-type="bibr" rid="CR39">39</xref>
, <xref ref-type="bibr" rid="CR40">40</xref>
, <xref ref-type="bibr" rid="CR42">42</xref>
, <xref ref-type="bibr" rid="CR46">46</xref>
, <xref ref-type="bibr" rid="CR51">51</xref>
, <xref ref-type="bibr" rid="CR56">56</xref>
], and seven supported a positive association (Table <xref rid="Tab2" ref-type="table">2</xref>
).</p>
<p>In NHANES, a positive association between uBPA concentrations and self-reported diabetes was reported in the NHANES 2003–04 cycle (OR = 1.39, 95 % CI: 1.21–1.60) [<xref ref-type="bibr" rid="CR39">39</xref>
], but results did not reach significance in the NHANES 2005–06 [<xref ref-type="bibr" rid="CR40">40</xref>
] nor 2007–08 [<xref ref-type="bibr" rid="CR46">46</xref>
] populations. Indeed, Casey & Neidell found significant interactions between uBPA and NHANES cycle [<xref ref-type="bibr" rid="CR37">37</xref>
]. Using 3 different statistical models within NHANES cycles from 2003–04 to 2007–08, they reported a positive association in only the 2003–04 cycle.</p>
<p>In a pooled NHANES 2003–08 dataset, Shankar & Teppala used a definition of diabetes based on fasting glucose level, HbA1c level, non-fasting glucose level and self-reported current use of diabetes medication, and found a significant positive linear trend across uBPA quartiles (<italic>p</italic>
= 0.002) [<xref ref-type="bibr" rid="CR42">42</xref>
]. Although both statistically significant, the OR for quartile 4 (Q4) compared to quartile 1 (Q1) was about two times higher in normal weight participants (OR = 3.17) than in overweight/obese participants (OR = 1.56).</p>
<p>No significant association was shown in a Korean cross-sectional study [<xref ref-type="bibr" rid="CR56">56</xref>
]. In a Chinese cross-sectional study, the adjusted OR for type 2 diabetes was statistically significant in the second (OR = 1.30, 95 % CI: 1.03–1.64) and fourth (OR = 1.37, 95 % CI: 1.08–1.74) uBPA quartiles, but not in the third uBPA quartile (OR = 1.09, 95 % CI: 0.86–1.39), compared to the first quartile [<xref ref-type="bibr" rid="CR51">51</xref>
]. Among 131 Iranian participants, Ahmadkhaniha et al. reported a significant adjusted OR of 57 for type 2 diabetes when comparing the participants with uBPA above the median to those with uBPA below the median [<xref ref-type="bibr" rid="CR32">32</xref>
].</p>
<p>One prospective study, among U.S. women from the NHS and the NHSII cohorts, has been published [<xref ref-type="bibr" rid="CR61">61</xref>
]. While a positive association between uBPA and incident diabetes was reported among middle-aged women from the NHSII study (OR = 2.08, 95 % CI: 1.17–3.69, for Q4 vs. Q1), no significant results were found in older women from the NHS study (OR = 0.81, 95 % CI: 0.48–1.38, for Q4 vs. Q1).</p>
</sec>
<sec id="Sec17"><title>Prediabetes and hyperglycemia</title>
<p>In one cross-sectional study, there was a positive association between uBPA tertiles and prediabetes, with associations stronger in women and obese subjects [<xref ref-type="bibr" rid="CR41">41</xref>
]. Two cross-sectional studies reported the relation between uBPA and elevated fasting blood glucose, one in children [<xref ref-type="bibr" rid="CR38">38</xref>
], one in adults [<xref ref-type="bibr" rid="CR34">34</xref>
]; neither reported a significant association.</p>
</sec>
<sec id="Sec18"><title>Meta-analysis</title>
<p>For prevalent diabetes, the inclusion of the study by Ahmadkhaniha et al. [<xref ref-type="bibr" rid="CR32">32</xref>
] led to highly significant heterogeneity (<italic>p</italic>
< 10<sup>−5</sup>
and I<sup>2</sup>
= 94 %); consequently we excluded this study from the meta-analysis. Finally, three cross-sectional studies, all examining uBPA levels in quartiles, were included in the meta-analysis (<italic>n</italic>
= 9291) [<xref ref-type="bibr" rid="CR37">37</xref>
, <xref ref-type="bibr" rid="CR51">51</xref>
, <xref ref-type="bibr" rid="CR56">56</xref>
]. Pooled ORs (95 % CI) were 1.33 (1.10–1.61), 1.18 (0.97–1.44) and 1.47 (1.21–1.80) in the second, third, and fourth uBPA quartiles compared to the first uBPA quartile. No significant heterogeneity was observed (<italic>p</italic>
= 0.88, 0.41 and 0.55 respectively, I<sup>2</sup>
= 0 %). We were unable to conduct a meta-analysis for the other outcomes due to insufficient numbers of studies.</p>
</sec>
</sec>
<sec id="Sec19"><title>Anthropometry and adiposity</title>
<p>The relationships between uBPA and measures of anthropometry (e.g., weight, overweight, obesity) or adiposity (e.g., fat mass) were investigated in 16 studies, including 8 studies conducted in children (Table <xref rid="Tab3" ref-type="table">3</xref>
).</p>
<sec id="Sec20"><title>Overweight and obesity</title>
<p>A positive cross-sectional association between uBPA and overweight was reported in 2 studies [<xref ref-type="bibr" rid="CR49">49</xref>
, <xref ref-type="bibr" rid="CR64">64</xref>
], whereas 5 publications reported no significant associations with overweight [<xref ref-type="bibr" rid="CR36">36</xref>
, <xref ref-type="bibr" rid="CR38">38</xref>
, <xref ref-type="bibr" rid="CR47">47</xref>
, <xref ref-type="bibr" rid="CR52">52</xref>
, <xref ref-type="bibr" rid="CR55">55</xref>
]. In the only longitudinal study, uBPA concentrations at age 5 were not associated with overweight at age 9 [<xref ref-type="bibr" rid="CR64">64</xref>
]. All but one study found a significant positive cross-sectional association between higher uBPA concentrations and obesity [<xref ref-type="bibr" rid="CR35">35</xref>
, <xref ref-type="bibr" rid="CR38">38</xref>
, <xref ref-type="bibr" rid="CR44">44</xref>
, <xref ref-type="bibr" rid="CR47">47</xref>
, <xref ref-type="bibr" rid="CR52">52</xref>
, <xref ref-type="bibr" rid="CR55">55</xref>
], with ORs ranging from 1.50 to 2.57 for Q4 vs. Q1.</p>
</sec>
<sec id="Sec21"><title>Waist circumference</title>
<p>The four cross-sectional studies examining the relationship between uBPA and prevalent abdominal obesity in adults showed significant positive results [<xref ref-type="bibr" rid="CR36">36</xref>
, <xref ref-type="bibr" rid="CR44">44</xref>
, <xref ref-type="bibr" rid="CR52">52</xref>
, <xref ref-type="bibr" rid="CR57">57</xref>
]. Eng et al. reported that in children, higher uBPA concentrations were significantly associated with elevated WC-to-height ratio (WHR), but not with elevated WC [<xref ref-type="bibr" rid="CR38">38</xref>
].</p>
<p>Three studies considered WC or WHR as a continuous variable. One showed a positive linear association between daily BPA excretion and WC [<xref ref-type="bibr" rid="CR58">58</xref>
] and another, in women, reported a significant positive correlation between uBPA concentrations and WC [<xref ref-type="bibr" rid="CR53">53</xref>
]. The only study in children found a statistically significant positive association between uBPA and WHR [<xref ref-type="bibr" rid="CR48">48</xref>
].</p>
</sec>
<sec id="Sec22"><title>Weight and BMI</title>
<p>Three cross-sectional studies examined the association between uBPA and weight [<xref ref-type="bibr" rid="CR58">58</xref>
] or BMI [<xref ref-type="bibr" rid="CR50">50</xref>
, <xref ref-type="bibr" rid="CR53">53</xref>
] as continuous variables. Both Chinese studies by Wang et al. [<xref ref-type="bibr" rid="CR50">50</xref>
] and Zhao et al. [<xref ref-type="bibr" rid="CR53">53</xref>
] reported significant positive associations between uBPA and BMI. Galloway et al. [<xref ref-type="bibr" rid="CR58">58</xref>
] showed that daily BPA excretion was significantly and positively associated with BMI and weight in Italian adults.</p>
<p>Among the prospective studies, one reported that early childhood uBPA concentrations were associated with a modest and non-significant reduction in child BMI between 2 and 5 years of age [<xref ref-type="bibr" rid="CR63">63</xref>
], whereas the other found that higher uBPA concentrations were significantly associated with modestly faster weight gain in women [<xref ref-type="bibr" rid="CR62">62</xref>
].</p>
</sec>
<sec id="Sec23"><title>Adiposity</title>
<p>In Chinese healthy premenopausal women, fat mass was significantly correlated with uBPA when adjusting for age [<xref ref-type="bibr" rid="CR53">53</xref>
]. In pooled NHANES 2003–10, abnormal body fat in children was not associated with uBPA concentrations in quartiles [<xref ref-type="bibr" rid="CR38">38</xref>
].</p>
</sec>
<sec id="Sec24"><title>Meta-analysis</title>
<p>We included 5 cross-sectional studies for overweight [<xref ref-type="bibr" rid="CR36">36</xref>
, <xref ref-type="bibr" rid="CR38">38</xref>
, <xref ref-type="bibr" rid="CR49">49</xref>
, <xref ref-type="bibr" rid="CR52">52</xref>
, <xref ref-type="bibr" rid="CR64">64</xref>
], including 2 in adults, 3 cross-sectional studies for obesity [<xref ref-type="bibr" rid="CR38">38</xref>
, <xref ref-type="bibr" rid="CR44">44</xref>
, <xref ref-type="bibr" rid="CR52">52</xref>
], including 2 in adults, and 4 cross-sectional studies for elevated WC [<xref ref-type="bibr" rid="CR38">38</xref>
, <xref ref-type="bibr" rid="CR44">44</xref>
, <xref ref-type="bibr" rid="CR52">52</xref>
, <xref ref-type="bibr" rid="CR57">57</xref>
], including 3 in adults.</p>
<p>Higher BPA exposure was significantly associated with obesity and elevated WC, and no significant heterogeneity between studies was found (Table <xref rid="Tab5" ref-type="table">5</xref>
). There was evidence for overweight only in adults.<table-wrap id="Tab5"><label>Table 5</label>
<caption><p>Pooled OR estimates for diabetes, overweight, obesity, elevated waist circumference and hypertension comparing extreme categories of urinary BPA levels (the highest vs. the lowest): random effect models</p>
</caption>
<table frame="hsides" rules="groups"><thead><tr><th rowspan="2">Outcome</th>
<th rowspan="2">Number of studies</th>
<th rowspan="2">Pooled OR<sup>a</sup>
(95 % CI)</th>
<th colspan="2">Heterogeneity</th>
</tr>
<tr><th><italic>p</italic>
-value</th>
<th>I<sup>2</sup>
(%)</th>
</tr>
</thead>
<tbody><tr><td>Prevalent diabetes</td>
<td>3</td>
<td>1.47 (1.21–1.80)</td>
<td>0.55</td>
<td>0</td>
</tr>
<tr><td>Prevalent overweight</td>
<td></td>
<td></td>
<td></td>
<td></td>
</tr>
<tr><td> Total</td>
<td>5</td>
<td>1.21 (0.98–1.50)</td>
<td>0.09</td>
<td>45</td>
</tr>
<tr><td> Children only</td>
<td>3</td>
<td>1.24 (0.88–1.75)</td>
<td>0.03</td>
<td>62</td>
</tr>
<tr><td> Adults only</td>
<td>2</td>
<td>1.25 (1.01–1.56)</td>
<td>0.84</td>
<td>0</td>
</tr>
<tr><td>Prevalent obesity</td>
<td></td>
<td></td>
<td></td>
<td></td>
</tr>
<tr><td> Total</td>
<td>3</td>
<td>1.67 (1.41–1.98)</td>
<td>0.44</td>
<td>0</td>
</tr>
<tr><td> Adults only</td>
<td>2</td>
<td>1.60 (1.32–1.93)</td>
<td>0.54</td>
<td>0</td>
</tr>
<tr><td>Prevalent elevated WC</td>
<td></td>
<td></td>
<td></td>
<td></td>
</tr>
<tr><td> Total</td>
<td>4</td>
<td>1.48 (1.25–1.76)</td>
<td>0.28</td>
<td>21</td>
</tr>
<tr><td> Adults only</td>
<td>3</td>
<td>1.52 (1.21–1.90)</td>
<td>0.15</td>
<td>47</td>
</tr>
<tr><td>Prevalent hypertension</td>
<td>2</td>
<td>1.41 (1.12–1.79)</td>
<td>0.50</td>
<td>0</td>
</tr>
</tbody>
</table>
<table-wrap-foot><p><italic>BPA</italic>
bisphenol A; <italic>CI</italic>
, confidence interval; <italic>OR</italic>
odds ratio; <italic>WC</italic>
waist circumference</p>
<p><sup>a</sup>
Using ORs comparing extreme categories of urinary BPA levels (the highest vs. the lowest) summarized in Tables <xref rid="Tab2" ref-type="table">2</xref>
, <xref rid="Tab3" ref-type="table">3</xref>
and <xref rid="Tab4" ref-type="table">4</xref>
</p>
</table-wrap-foot>
</table-wrap>
</p>
</sec>
</sec>
<sec id="Sec25"><title>Cardiovascular disease and hypertension</title>
<sec id="Sec26"><title>Cardiovascular disease</title>
<p>Four of the five cross-sectional studies reported a positive linear association between uBPA and CVD (Table <xref rid="Tab4" ref-type="table">4</xref>
). An increased risk of self-reported CVD (myocardial infarction, angina, or coronary heart disease [CHD]: alone or combined) was associated with increased concentration of uBPA (OR = 1.39, 95 % CI: 1.18–1.63), but no increased risk of stroke (OR = 0.97, 95 % CI: 0.74–1.27) in NHANES 2003–04 [<xref ref-type="bibr" rid="CR39">39</xref>
]. Melzer et al. then reported similar associations when including NHANES 2005–06 data [<xref ref-type="bibr" rid="CR40">40</xref>
]. LaKind et al. examined NHANES data from 2003–04 to 2009–10 in adults aged ≥20 years, and found no significant associations between self-reported CHD, heart attack and uBPA as a continuous variable in either separate or pooled populations [<xref ref-type="bibr" rid="CR33">33</xref>
]. Casey & Neidell reported significant positive associations between uBPA and CHD in NHANES 2003–04 but results were not consistent in the subsequent 2005/06 and 2007/08 cycles [<xref ref-type="bibr" rid="CR37">37</xref>
]. Melzer et al. studied coronary artery disease (CAD) severity assessed by angiography [<xref ref-type="bibr" rid="CR59">59</xref>
]. Compared to participants without CAD (<italic>n</italic>
= 120), uBPA concentrations – per standard deviation (SD) increase – were significantly associated with severe CAD (OR = 1.43, 95 % CI: 1.03–1.98; <italic>n</italic>
= 385), and near significantly associated with intermediate CAD (OR = 1.69, 95 % CI: 0.98–2.94; <italic>n</italic>
= 86).</p>
<p>The only prospective study, a nested case–control study within the EPIC-Norfolk cohort, reported a positive association between uBPA concentrations and incidence of CAD up to 10 years after BPA measurement, with a significant increase in risk of CAD per SD increase in uBPA: OR = 1.11, 95 % CI = 1.00-1.23 [<xref ref-type="bibr" rid="CR60">60</xref>
].</p>
</sec>
<sec id="Sec27"><title>Hypertension</title>
<p>Three cross-sectional studies examined the association between uBPA and hypertension (Table <xref rid="Tab4" ref-type="table">4</xref>
). Both Shankar & Teppala (using NHANES 2003–04 data) [<xref ref-type="bibr" rid="CR43">43</xref>
] and Shiue et al. (NHANES 2009–10) [<xref ref-type="bibr" rid="CR45">45</xref>
] showed a positive association between uBPA and hypertension. Bae et al. reported a positive but non-significant association between uBPA and hypertension (OR = 1.27, 95 % CI: 0.85–1.88 for Q4 vs. Q1) in an elderly Korean population, and the association reached significance when the analyses were restricted to participants without a previous history of hypertension (OR = 2.35, 95 % CI: 1.33–4.17) [<xref ref-type="bibr" rid="CR54">54</xref>
].</p>
</sec>
<sec id="Sec28"><title>Meta-analysis</title>
<p>Meta-analysis for the CVD and uBPA data was not possible owing to different study designs and use of overlapping NHANES data. For hypertension, we included two cross-sectional studies and the pooled OR was statistically significant (Table <xref rid="Tab5" ref-type="table">5</xref>
).</p>
</sec>
</sec>
</sec>
<sec id="Sec29" sec-type="discussion"><title>Discussion</title>
<sec id="Sec30"><title>Summary of evidence</title>
<p>Our analysis presents summarized evidence of BPA exposure and its associations with chronic cardiometabolic disorders including glucose abnormalities, measures of overweight/obesity, CVD and hypertension in humans.</p>
<p>Of the 33 epidemiological studies included, results were generally consistent across cross-sectional studies, with positive associations between uBPA concentrations and diabetes, general obesity, abdominal obesity, CVD and hypertension suggested in 7/8, 6/7, 5/5, 4/5 and 2/3 publications respectively. We were able to conduct outcome-specific meta-analysis including 12 independent studies. While a risk of bias cannot be excluded, the results indicate positive cross-sectional associations between uBPA concentrations and diabetes, general obesity, abdominal obesity and hypertension. Results were significant for overweight in adults but not in children. We were unable to examine uBPA and CVD in meta-analysis due to overlapping data and/or heterogeneity among studies (in terms of study design and definition of outcome).</p>
<p>Among the 5 prospective studies included in this review, 3 showed that uBPA levels were positively associated with incident type 2 diabetes and CAD, and weight gain. While these first prospective results seem to corroborate findings from cross-sectional studies, more prospective data are needed to make the evidence more robust.</p>
</sec>
<sec id="Sec31"><title>Strengths and limitations of the current review</title>
<p>In recent years, there has been a rapid increase in publications examining the possible relationship between BPA exposure and cardiometabolic health. A systematic review of the epidemiological evidence linking BPA with indicators of obesity, glucose metabolism and CVD, was published by LaKind et al. in 2014 [<xref ref-type="bibr" rid="CR33">33</xref>
]. Further to their results, we have been able to include 11 further publications into this review. We have also calculated pooled ORs for diabetes, overweight, general/abdominal obesity, and hypertension. In their systematic review, LaKind et al. concluded that meta-analysis was not feasible due to the heterogeneity across studies. Nonetheless we were able to identify small but significant groups of cross-sectional studies similar enough to be included in a meta-analysis. However it should be noted that studies included in the meta-analyses can differ with regard to some characteristics, such as outcome ascertainment (especially for diabetes), adjustment variables, and exposure contrast.</p>
<p>As with many reviews of observational data, the risk of publication bias cannot be completely ruled out and it can be hypothesized that studies with significant and positive results are more widely disseminated than those with non-significant and/or negative results. We considered producing funnel plots to explore the presence of publication bias across studies included in the meta-analyses. However, as a rule of thumb, tests for funnel plot asymmetry should not be used when there are fewer than 10 studies in the meta-analysis because test power is usually too low to distinguish chance from real asymmetry [<xref ref-type="bibr" rid="CR65">65</xref>
]. We restricted this review to studies published in English, due to the generalization of the English language in scientific publications. To ascertain if we may have omitted studies not published in English, we ran the same search in PubMed, but limiting the results to non-English languages. We found 12 new articles (5 in Chinese, 3 in Japanese, 2 in Italian, 1 in Spanish, and 1 in Czech), but based on abstract, none of them met the eligibility criteria other than language.</p>
</sec>
<sec id="Sec32"><title>Strengths and limitations of studies included in the review</title>
<p>Most studies were not designed with environmental exposures in mind. Even though there is evidence for a cross-sectional relation between uBPA and cardiometabolic disorders, results were different across studies, even in different cycles from the same study (NHANES). Depending on the studies, possible explanations could be incomplete adjustment for confounders, measurement error, or differences in study design.</p>
<p>When studying the relation between BPA exposure and cardiometabolic disorders, the statistical models should be properly adjusted for confounding variables. Dietary intake, especially high levels of processed food, has to be considered as a major potential confounding factor for the relationship between uBPA and metabolic disease. It has been suggested that people with diabetes or obesity may consume more food, either in absolute volume or from BPA-containing packaging (plastic containers, polycarbonate drink bottles, tin cans coated with epoxy resin, etc.), which may result in higher uBPA concentrations than non-diabetic or healthy weight individuals. Therefore we can suggest that positive findings observed in cross-sectional studies may be due to dietary sources of BPA exposure that are also important predictors of adiposity. Less than one-third of studies included in this review controlled for diet, mostly <italic>via</italic>
total daily energy intake, and only 1 for possible dietary sources of BPA exposure (canned tuna fish and bottled water consumption). Thus, there is a strong need for observational studies controlling for dietary characteristics including potential sources of BPA exposure. Moreover, food and drink in BPA-containing packaging are not necessarily similar in terms of nutritional value (e.g., canned vegetables compared to processed meat, or bottled water compared to sugar-sweetened beverages). Consequently, there is a requirement for data on both dietary patterns (e.g., overall energy intake) along with sources of dietary exposure to BPA, as this helps disentangle real associations from confounding.</p>
<p>Additionally, given the potential correlation of environmental toxicants with each other, exposure to other EDCs may be another confounding factor. Two studies controlled for exposure to other environmental phenols [<xref ref-type="bibr" rid="CR47">47</xref>
] or to phthalates [<xref ref-type="bibr" rid="CR37">37</xref>
]. In both studies, when added to final multivariable models, the authors reported that the other contaminants did not substantially change the associations of uBPA concentrations with the studied outcomes.</p>
<p>Other methodological limitations of studies relate to BPA exposure assessment. BPA concentrations have been mostly determined in a single urine measurement. There is accumulating evidence that a single measurement may not reflect chronic exposure to BPA: regardless of the timing of urine sampling (spot, first morning void, 24 h collection), BPA concentrations were shown, in individual adults, to considerably vary throughout the day and the week [<xref ref-type="bibr" rid="CR66">66</xref>
]. Thus, using only a single uBPA measurement may lead to non-differential exposure misclassification of the participants and bias the estimates. The study by Snijder et al., in pregnant women, showed that using only one uBPA measurement resulted in underestimation of the association between maternal uBPA and fetal growth, which was stronger and significant when several measurements were taken into account [<xref ref-type="bibr" rid="CR67">67</xref>
]. Consequently, it would be better to increase the number of measurements per participant. However, in the context of large-scale epidemiological studies, the substantial cost of the BPA assay is clearly a limitation. Interestingly, most studies report only a single urinary measurement yet the majority show positive associations between uBPA levels and the outcomes of interest.</p>
<p>Another controversy that exists in the BPA literature relates to the lack of knowledge on ‘deep’ compartments, which may serve as potential sources of BPA exposure. Before being metabolized by the liver, BPA is a lipophilic compound. Although it was thought to be rapidly metabolized and excreted, recent data showed a half-life longer than expected, suggesting a potential accumulation in body tissues such as adipose tissue [<xref ref-type="bibr" rid="CR68">68</xref>
]. In agreement with this hypothesis, Fernandez et al. showed, among 20 Spanish women, that unconjugated BPA was detected in adipose tissue in 55 % of the samples [<xref ref-type="bibr" rid="CR69">69</xref>
].</p>
<p>The other key issue in the human data is the lack of prospective data, reflecting the inherent difficulties in performing longitudinal studies, which are costly and time-consuming. Five studies used a prospective design and the main outcomes differ. Although literature in this area is rapidly increasing, the majority of studies published have, and continue to be, of a cross-sectional nature. Indeed, among the 11 studies published between 1 June 2013 and 1 August 2014, only 3 have a prospective design. Nearly half of the publications included in this review relied on NHANES cross-sectional data, including a substantial number of publications using the same study population. Consequently, it is imperative that more prospective epidemiological data is presented, especially with outcomes related to glucose tolerance and anthropometry, which appear to show the most consistent associations. Certainly, given chronic diseases such as diabetes develop over a timespan of many years, timing of BPA measurement would need to occur within an etiologically relevant window before diagnosis of the disease.</p>
<p>Differences in analyses and results contribute to confusion about the association between BPA exposure and cardiometabolic disorders. As Casey & Neidell highlighted, using continuous uBPA, continuous log-transformed uBPA or uBPA in quartiles as exposure variable can lead to lack of consistency in results in a same data set [<xref ref-type="bibr" rid="CR37">37</xref>
]. It therefore seems difficult to draw definitive conclusions from the available data, and publications may be vulnerable to biases given that the same data set can produce significant or non-significant associations according to the different statistical models utilized.</p>
<p>At present, the “gold standard” method for testing BPA is solid-phase extraction coupled with HPLC-MS/MS with peak focusing [<xref ref-type="bibr" rid="CR13">13</xref>
]. Overall, chromatography-based methods are expensive and, thus, not particularly suitable for the large numbers of samples which are required to ensure that analyses are adequately powered to detect any association. Less expensive methods have been proposed, focusing on BPA metabolites (e.g., BPA-glucuronide) [<xref ref-type="bibr" rid="CR70">70</xref>
, <xref ref-type="bibr" rid="CR71">71</xref>
]. It has been suggested that part of the BPA measured in human samples can be due to contamination during sample collection or laboratory measurements [<xref ref-type="bibr" rid="CR72">72</xref>
, <xref ref-type="bibr" rid="CR73">73</xref>
], and one of the great advantages of studying BPA metabolites is to avoid these contamination issues. The lower cost of these methods would also allow measuring BPA in larger populations. However, at present, the use of urinary levels of BPA metabolites as surrogates for BPA exposure remains to be validated.</p>
</sec>
<sec id="Sec33"><title>Future research and implications</title>
<p>Experimental studies have suggested that BPA exposure is associated with abnormal glucose metabolism and insulin resistance. However, data from observational studies of humans supporting an association between BPA and obesity, diabetes and CVD are still too limited in cross-sectional studies to make definitive statements of harm. It is imperative that more prospective studies, with careful measurements of dietary intake, socioeconomic status and urine dilution, are conducted to understand the potential impact BPA exposure in humans will have on the development of chronic disease. Concerning the health outcomes of interest, if associations with overweight/obesity defined according to BMI have been much studied, there are a limited number of studies using more accurate measures of adiposity (such as percent body fat or fat mass). In some studies, analyses were stratified by gender, age, BMI or pre-existing disease. Future studies should continue to explore the existence of populations potentially at greatest risk for BPA-related health effects, in order to confirm or refute these first results. Irrespective of outcome, if confirmed, reasons for differences in these associations will need further exploration. Certainly, no epidemiological study has aimed to identify critical windows of exposure and the risk of incident cardiometabolic disorders. For chronic diseases which have a long latent period, different lag times should be tested. This should feature in future longitudinal studies, especially in paediatric cohorts.</p>
<p>Even in the absence of certainty, there are growing community concerns about the possible deleterious impact of BPA on human health. In agreement with the precautionary principle, regulations have been adopted by a number of countries, prohibiting BPA in baby feeding bottles, in food containers for young children, or in all food and drink packaging, with the aim of reducing human exposure to BPA [<xref ref-type="bibr" rid="CR74">74</xref>
]. If the hypothesised associations are confirmed, this will not only provide evidence to further limit or ban the use of BPA in the food industry, but also advance the impetus to research other health outcomes, and to further explore the impact of a broad range of potential environmental toxins on chronic disease. Lastly, given the recent efforts to reduce BPA exposure, finding safe alternatives to BPA is a very important issue. While BPA can be replaced by structurally similar molecules, such as other bisphenols (e.g., bisphenol S, bisphenol F), initial studies suggest similar endocrine disrupting effects [<xref ref-type="bibr" rid="CR75">75</xref>
], and epidemiological studies should now also consider exposure to BPA-replacement chemicals.</p>
</sec>
</sec>
<sec id="Sec34" sec-type="conclusion"><title>Conclusion</title>
<p>In summary, we have shown that uBPA at levels found in the general population is associated with increased prevalence of diabetes, general and abdominal obesity, and hypertension. Additional prospective data are needed to ascertain the nature of the relationship between BPA exposure and cardiometabolic disorders. Prospective cohort studies, with carefully collected data on dietary sources of BPA exposure and other potential confounders, as well as repeated uBPA measurements, are indicated and will likely prove useful in filling this gap in the literature and clarifying/explicating these complex relationships.</p>
</sec>
</body>
<back><app-group><app id="App1"><sec id="Sec35"><title>Additional file</title>
<p><media position="anchor" xlink:href="12940_2015_36_MOESM1_ESM.pdf" id="MOESM1"><label>Additional file 1: Figure S1.</label>
<caption><p>Full PubMed search strategy used in the systematic review. <bold>Table S1.</bold>
Descriptive characteristics of studies included in the systematic review (<italic>n</italic>
= 33 studies). <bold>Table S2.</bold>
Studies from the systematic review included and excluded from the meta-analysis and reasons for exclusion. <bold>Table S3.</bold>
Overview of studies using data from the National Health and Nutrition Examination Survey (NHANES). <bold>Table S4.</bold>
Assessment of the quality of individual studies. <bold>Figure S2.</bold>
Individual and pooled OR estimates for diabetes, overweight, obesity, elevated waist circumference and hypertension comparing extreme categories of urinary BPA levels (the highest vs. the lowest): random effect models.</p>
</caption>
</media>
</p>
</sec>
</app>
</app-group>
<glossary><title>Abbreviations</title>
<def-list><def-item><term>ADA</term>
<def><p>American Diabetes Association</p>
</def>
</def-item>
<def-item><term>ALT</term>
<def><p>Alanine aminotransferase</p>
</def>
</def-item>
<def-item><term>BMI</term>
<def><p>Body mass index</p>
</def>
</def-item>
<def-item><term>BP</term>
<def><p>Blood pressure</p>
</def>
</def-item>
<def-item><term>BPA</term>
<def><p>Bisphenol A</p>
</def>
</def-item>
<def-item><term>CAD</term>
<def><p>Coronary artery disease</p>
</def>
</def-item>
<def-item><term>CHAMACOS</term>
<def><p>Center for the health assessment of mothers and children of Salinas</p>
</def>
</def-item>
<def-item><term>CHD</term>
<def><p>Coronary heart disease</p>
</def>
</def-item>
<def-item><term>CI</term>
<def><p>Confidence interval</p>
</def>
</def-item>
<def-item><term>CVD</term>
<def><p>Cardiovascular disease</p>
</def>
</def-item>
<def-item><term>EDCs</term>
<def><p>Endocrine-disrupting chemicals</p>
</def>
</def-item>
<def-item><term>eGFR</term>
<def><p>Estimated glomerular filtration rate</p>
</def>
</def-item>
<def-item><term>EPIC</term>
<def><p>European prospective investigation into cancer</p>
</def>
</def-item>
<def-item><term>ER</term>
<def><p>Estrogen-related receptor</p>
</def>
</def-item>
<def-item><term>GGT</term>
<def><p>Gamma glutamyltransferase</p>
</def>
</def-item>
<def-item><term>HOMA</term>
<def><p>Homeostasis model of assessment</p>
</def>
</def-item>
<def-item><term>HOME</term>
<def><p>Health outcomes and measures of the environment</p>
</def>
</def-item>
<def-item><term>HDL</term>
<def><p>High density lipoprotein</p>
</def>
</def-item>
<def-item><term>HPLC-MS/MS</term>
<def><p>High performance liquid chromatography–tandem mass spectrometry</p>
</def>
</def-item>
<def-item><term>HR</term>
<def><p>Hazard ratio</p>
</def>
</def-item>
<def-item><term>hsCRP</term>
<def><p>High-sensitivity C-reactive protein</p>
</def>
</def-item>
<def-item><term>IQR</term>
<def><p>Interquartile range</p>
</def>
</def-item>
<def-item><term>LDL</term>
<def><p>Low density lipoprotein</p>
</def>
</def-item>
<def-item><term>LOD</term>
<def><p>Limit of detection</p>
</def>
</def-item>
<def-item><term>LOQ</term>
<def><p>Limit of quantification</p>
</def>
</def-item>
<def-item><term>NHANES</term>
<def><p>National health and nutrition examination survey</p>
</def>
</def-item>
<def-item><term>NHS</term>
<def><p>Nurses’ health study</p>
</def>
</def-item>
<def-item><term>OR</term>
<def><p>Odds ratio</p>
</def>
</def-item>
<def-item><term>PPAR</term>
<def><p>Peroxisome proliferation agonist receptor</p>
</def>
</def-item>
<def-item><term>PRISMA</term>
<def><p>Preferred reporting items for systematic reviews and meta-analyses</p>
</def>
</def-item>
<def-item><term>Q1</term>
<def><p>First quartile</p>
</def>
</def-item>
<def-item><term>Q4</term>
<def><p>Fourth quartile</p>
</def>
</def-item>
<def-item><term>TG</term>
<def><p>Triglycerides</p>
</def>
</def-item>
<def-item><term>SD</term>
<def><p>Standard deviation</p>
</def>
</def-item>
<def-item><term>SE</term>
<def><p>Standard error</p>
</def>
</def-item>
<def-item><term>uBPA</term>
<def><p>Urinary bisphenol A</p>
</def>
</def-item>
<def-item><term>WC</term>
<def><p>Waist circumference</p>
</def>
</def-item>
<def-item><term>WHR</term>
<def><p>Waist circumference-to-height ratio</p>
</def>
</def-item>
</def-list>
</glossary>
<fn-group><fn><p>Fanny Rancière and Jasmine G. Lyons contributed equally to this work.</p>
</fn>
<fn><p><bold>Competing interests</bold>
</p>
<p>The authors declare that they have no competing interests.</p>
</fn>
<fn><p><bold>Authors’ contributions</bold>
</p>
<p>FR, JL, VL and DJM participated in literature searching, data extraction and data analysis and drafted the manuscript. JB, TG, TW, JES critically revised the manuscript for important intellectual content. All authors approved the final version.</p>
</fn>
</fn-group>
<ack><p>This study was funded by the National Health and Medical Research Council, Australia (NHMRC grant APP1022923). Support for FR was provided by a postdoctoral grant from CORDDIM (field of major interest of the Île-de-France Regional Council “Cardiovascular/Obesity/Kidney/Diabetes”), the French Endocrine Disruptor Research Programme (PNRPE grant) and the Scientific Mobility Program of the Embassy of France in Australia (2014). JGL is supported by National Heart Foundation of Australia/NHMRC postgraduate scholarship [586739] and the Cardiac Society of Australia and New Zealand. This work was supported in part by the Victorian Government’s OIS Program.</p>
</ack>
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