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<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en">Bayesian hierarchical distributed lag models for summer ozone exposure and cardio-respiratory mortality</title>
<author><name sortKey="Huang, Yi" sort="Huang, Yi" uniqKey="Huang Y" first="Yi" last="Huang">Yi Huang</name>
<affiliation><nlm:aff id="A1">Department of Biostatistics, Bloomberg School of Public Health, Johns Hopkins University, 615 N. Wolfe Street, Baltimore, MD 21205-3179, U.S.A.</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Dominici, Francesca" sort="Dominici, Francesca" uniqKey="Dominici F" first="Francesca" last="Dominici">Francesca Dominici</name>
<affiliation><nlm:aff id="A1">Department of Biostatistics, Bloomberg School of Public Health, Johns Hopkins University, 615 N. Wolfe Street, Baltimore, MD 21205-3179, U.S.A.</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Bell, Michelle L" sort="Bell, Michelle L" uniqKey="Bell M" first="Michelle L." last="Bell">Michelle L. Bell</name>
<affiliation><nlm:aff id="A2">Forestry and Environmental Studies, Yale University, 205 Prospect Street, New Haven, CT 06511, USA</nlm:aff>
</affiliation>
</author>
</titleStmt>
<publicationStmt><idno type="wicri:source">PMC</idno>
<idno type="pmid">23825932</idno>
<idno type="pmc">3697867</idno>
<idno type="url">http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3697867</idno>
<idno type="RBID">PMC:3697867</idno>
<idno type="doi">10.1002/env.721</idno>
<date when="2005">2005</date>
<idno type="wicri:Area/Pmc/Corpus">000197</idno>
</publicationStmt>
<sourceDesc><biblStruct><analytic><title xml:lang="en" level="a" type="main">Bayesian hierarchical distributed lag models for summer ozone exposure and cardio-respiratory mortality</title>
<author><name sortKey="Huang, Yi" sort="Huang, Yi" uniqKey="Huang Y" first="Yi" last="Huang">Yi Huang</name>
<affiliation><nlm:aff id="A1">Department of Biostatistics, Bloomberg School of Public Health, Johns Hopkins University, 615 N. Wolfe Street, Baltimore, MD 21205-3179, U.S.A.</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Dominici, Francesca" sort="Dominici, Francesca" uniqKey="Dominici F" first="Francesca" last="Dominici">Francesca Dominici</name>
<affiliation><nlm:aff id="A1">Department of Biostatistics, Bloomberg School of Public Health, Johns Hopkins University, 615 N. Wolfe Street, Baltimore, MD 21205-3179, U.S.A.</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Bell, Michelle L" sort="Bell, Michelle L" uniqKey="Bell M" first="Michelle L." last="Bell">Michelle L. Bell</name>
<affiliation><nlm:aff id="A2">Forestry and Environmental Studies, Yale University, 205 Prospect Street, New Haven, CT 06511, USA</nlm:aff>
</affiliation>
</author>
</analytic>
<series><title level="j">Environmetrics</title>
<idno type="ISSN">1180-4009</idno>
<idno type="eISSN">1099-095X</idno>
<imprint><date when="2005">2005</date>
</imprint>
</series>
</biblStruct>
</sourceDesc>
</fileDesc>
<profileDesc><textClass></textClass>
</profileDesc>
</teiHeader>
<front><div type="abstract" xml:lang="en"><title>SUMMARY</title>
<p id="P1">In this article we develop Bayesian hierarchical distributed lag models for estimating associations between daily variations in summer ozone levels and daily variations in cardiovascular and respiratory (CVDRESP) mortality counts for 19 large U.S. cities included in the National Morbidity, Mortality and Air Pollution Study (NMMAPS) for the summers of 1987–1994.</p>
<p id="P2">In the first stage, we define a semi-parametric distributed lag Poisson regression model to estimate city-specific relative rates of CVDRESP mortality associated with short-term exposure to summer ozone. In the second stage, we specify a class of distributions for the true city-specific relative rates to estimate an overall effect by taking into account the variability within and across cities. We perform the calculations with respect to several random effects distributions (normal, <italic>t</italic>
-student, and mixture of normal), thus relaxing the common assumption of a two-stage normal–normal hierarchical model. We assess the sensitivity of the results to: (i) lag structure for ozone exposure; (ii) degree of adjustment for long-term trends; (iii) inclusion of other pollutants in the model; (iv) heat waves; (v) random effects distributions; and (vi) prior hyperparameters.</p>
<p id="P3">On average across cities, we found that a 10ppb increase in summer ozone level over the previous week is associated with a 1.25 per cent increase in CVDRESP mortality (95 per cent posterior regions: 0.47, 2.03). The relative rate estimates are also positive and statistically significant at lags 0, 1 and 2. We found that associations between summer ozone and CVDRESP mortality are sensitive to the confounding adjustment for PM<sub>10</sub>
, but are robust to: (i) the adjustment for long-term trends, other gaseous pollutants (NO<sub>2</sub>
, SO<sub>2</sub>
and CO); (ii) the distributional assumptions at the second stage of the hierarchical model; and (iii) the prior distributions on all unknown parameters.</p>
<p id="P4">Bayesian hierarchical distributed lag models and their application to the NMMAPS data allow us to estimate of an acute health effect associated with exposure to ambient air pollution in the last few days on average across several locations. The application of these methods and the systematic assessment of the sensitivity of findings to model assumptions provide important epidemiological evidence for future air quality regulations.</p>
</div>
</front>
</TEI>
<pmc article-type="research-article"><pmc-comment>The publisher of this article does not allow downloading of the full text in XML form.</pmc-comment>
<pmc-dir>properties manuscript</pmc-dir>
<front><journal-meta><journal-id journal-id-type="nlm-journal-id">100968246</journal-id>
<journal-id journal-id-type="pubmed-jr-id">32662</journal-id>
<journal-id journal-id-type="nlm-ta">Environmetrics</journal-id>
<journal-id journal-id-type="iso-abbrev">Environmetrics</journal-id>
<journal-title-group><journal-title>Environmetrics</journal-title>
</journal-title-group>
<issn pub-type="ppub">1180-4009</issn>
<issn pub-type="epub">1099-095X</issn>
</journal-meta>
<article-meta><article-id pub-id-type="pmid">23825932</article-id>
<article-id pub-id-type="pmc">3697867</article-id>
<article-id pub-id-type="doi">10.1002/env.721</article-id>
<article-id pub-id-type="manuscript">NIHMS430382</article-id>
<article-categories><subj-group subj-group-type="heading"><subject>Article</subject>
</subj-group>
</article-categories>
<title-group><article-title>Bayesian hierarchical distributed lag models for summer ozone exposure and cardio-respiratory mortality</article-title>
</title-group>
<contrib-group><contrib contrib-type="author"><name><surname>Huang</surname>
<given-names>Yi</given-names>
</name>
<xref ref-type="aff" rid="A1">1</xref>
</contrib>
<contrib contrib-type="author"><name><surname>Dominici</surname>
<given-names>Francesca</given-names>
</name>
<xref ref-type="aff" rid="A1">1</xref>
<xref ref-type="corresp" rid="CR1">*</xref>
<xref ref-type="corresp" rid="CR2">†</xref>
</contrib>
<contrib contrib-type="author"><name><surname>Bell</surname>
<given-names>Michelle L.</given-names>
</name>
<xref ref-type="aff" rid="A2">2</xref>
</contrib>
</contrib-group>
<aff id="A1"><label>1</label>
Department of Biostatistics, Bloomberg School of Public Health, Johns Hopkins University, 615 N. Wolfe Street, Baltimore, MD 21205-3179, U.S.A.</aff>
<aff id="A2"><label>2</label>
Forestry and Environmental Studies, Yale University, 205 Prospect Street, New Haven, CT 06511, USA</aff>
<author-notes><corresp id="CR1"><label>*</label>
Correspondence to: F. Dominici, Department of Biostatistics, Bloomberg School of Public Health, Johns Hopkins University, 615 N. Wolfe Street, Baltimore, MD 21205-3179, U.S.A.</corresp>
<corresp id="CR2"><label>†</label>
<email>fdominic@jhsph.edu</email>
.</corresp>
</author-notes>
<pub-date pub-type="nihms-submitted"><day>23</day>
<month>1</month>
<year>2013</year>
</pub-date>
<pub-date pub-type="ppub"><month>8</month>
<year>2005</year>
</pub-date>
<pub-date pub-type="pmc-release"><day>01</day>
<month>7</month>
<year>2013</year>
</pub-date>
<volume>16</volume>
<issue>5</issue>
<fpage>547</fpage>
<lpage>562</lpage>
<permissions><copyright-statement>Copyright © 2005 John Wiley & Sons, Ltd.</copyright-statement>
<copyright-year>2005</copyright-year>
</permissions>
<abstract><title>SUMMARY</title>
<p id="P1">In this article we develop Bayesian hierarchical distributed lag models for estimating associations between daily variations in summer ozone levels and daily variations in cardiovascular and respiratory (CVDRESP) mortality counts for 19 large U.S. cities included in the National Morbidity, Mortality and Air Pollution Study (NMMAPS) for the summers of 1987–1994.</p>
<p id="P2">In the first stage, we define a semi-parametric distributed lag Poisson regression model to estimate city-specific relative rates of CVDRESP mortality associated with short-term exposure to summer ozone. In the second stage, we specify a class of distributions for the true city-specific relative rates to estimate an overall effect by taking into account the variability within and across cities. We perform the calculations with respect to several random effects distributions (normal, <italic>t</italic>
-student, and mixture of normal), thus relaxing the common assumption of a two-stage normal–normal hierarchical model. We assess the sensitivity of the results to: (i) lag structure for ozone exposure; (ii) degree of adjustment for long-term trends; (iii) inclusion of other pollutants in the model; (iv) heat waves; (v) random effects distributions; and (vi) prior hyperparameters.</p>
<p id="P3">On average across cities, we found that a 10ppb increase in summer ozone level over the previous week is associated with a 1.25 per cent increase in CVDRESP mortality (95 per cent posterior regions: 0.47, 2.03). The relative rate estimates are also positive and statistically significant at lags 0, 1 and 2. We found that associations between summer ozone and CVDRESP mortality are sensitive to the confounding adjustment for PM<sub>10</sub>
, but are robust to: (i) the adjustment for long-term trends, other gaseous pollutants (NO<sub>2</sub>
, SO<sub>2</sub>
and CO); (ii) the distributional assumptions at the second stage of the hierarchical model; and (iii) the prior distributions on all unknown parameters.</p>
<p id="P4">Bayesian hierarchical distributed lag models and their application to the NMMAPS data allow us to estimate of an acute health effect associated with exposure to ambient air pollution in the last few days on average across several locations. The application of these methods and the systematic assessment of the sensitivity of findings to model assumptions provide important epidemiological evidence for future air quality regulations.</p>
</abstract>
<kwd-group><kwd>Bayesian hierarchical model</kwd>
<kwd>distributed lag model</kwd>
<kwd>ozone</kwd>
<kwd>cardiovascular and respiratory mortality</kwd>
</kwd-group>
<funding-group><award-group><funding-source country="United States">National Institute of Environmental Health Sciences : NIEHS</funding-source>
<award-id>R01 ES012054 || ES</award-id>
</award-group>
<award-group><funding-source country="United States">National Institute of Environmental Health Sciences : NIEHS</funding-source>
<award-id>P30 ES003819 || ES</award-id>
</award-group>
</funding-group>
</article-meta>
</front>
</pmc>
</record>
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