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<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en">Which adults in the Paris metropolitan area have never been tested for HIV? A 2010 multilevel, cross-sectional, population-based study</title><author><name sortKey="Massari, Veronique" sort="Massari, Veronique" uniqKey="Massari V" first="Véronique" last="Massari">Véronique Massari</name><affiliation><nlm:aff id="Aff1">Sorbonne Universités, UPMC Univ Paris 06, INSERM, Institut Pierre Louis Institute d’Epidémiologie et de Santé Publique (IPLESP UMRS 1136), Department of Social Epidemiology, F-75012 Paris, France</nlm:aff></affiliation></author><author><name sortKey="Lapostolle, Annabelle" sort="Lapostolle, Annabelle" uniqKey="Lapostolle A" first="Annabelle" last="Lapostolle">Annabelle Lapostolle</name><affiliation><nlm:aff id="Aff1">Sorbonne Universités, UPMC Univ Paris 06, INSERM, Institut Pierre Louis Institute d’Epidémiologie et de Santé Publique (IPLESP UMRS 1136), Department of Social Epidemiology, F-75012 Paris, France</nlm:aff></affiliation></author><author><name sortKey="Grupposo, Marie Catherine" sort="Grupposo, Marie Catherine" uniqKey="Grupposo M" first="Marie-Catherine" last="Grupposo">Marie-Catherine Grupposo</name><affiliation><nlm:aff id="Aff1">Sorbonne Universités, UPMC Univ Paris 06, INSERM, Institut Pierre Louis Institute d’Epidémiologie et de Santé Publique (IPLESP UMRS 1136), Department of Social Epidemiology, F-75012 Paris, France</nlm:aff></affiliation></author><author><name sortKey="Dray Spira, Rosemary" sort="Dray Spira, Rosemary" uniqKey="Dray Spira R" first="Rosemary" last="Dray-Spira">Rosemary Dray-Spira</name><affiliation><nlm:aff id="Aff1">Sorbonne Universités, UPMC Univ Paris 06, INSERM, Institut Pierre Louis Institute d’Epidémiologie et de Santé Publique (IPLESP UMRS 1136), Department of Social Epidemiology, F-75012 Paris, France</nlm:aff></affiliation></author><author><name sortKey="Costagliola, Dominique" sort="Costagliola, Dominique" uniqKey="Costagliola D" first="Dominique" last="Costagliola">Dominique Costagliola</name><affiliation><nlm:aff id="Aff2">Sorbonne Universités, UPMC Univ Paris 06, INSERM, Institut Pierre Louis Institute d’Epidémiologie et de Santé Publique (IPLESP UMRS 1136), Department of HIV Clinical Research, F-75013 Paris, France</nlm:aff></affiliation></author><author><name sortKey="Chauvin, Pierre" sort="Chauvin, Pierre" uniqKey="Chauvin P" first="Pierre" last="Chauvin">Pierre Chauvin</name><affiliation><nlm:aff id="Aff1">Sorbonne Universités, UPMC Univ Paris 06, INSERM, Institut Pierre Louis Institute d’Epidémiologie et de Santé Publique (IPLESP UMRS 1136), Department of Social Epidemiology, F-75012 Paris, France</nlm:aff></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">PMC</idno><idno type="pmid">26198690</idno><idno type="pmc">4509770</idno><idno type="url">http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4509770</idno><idno type="RBID">PMC:4509770</idno><idno type="doi">10.1186/s12879-015-1006-9</idno><date when="2015">2015</date><idno type="wicri:Area/Pmc/Corpus">000608</idno><idno type="wicri:explorRef" wicri:stream="Pmc" wicri:step="Corpus" wicri:corpus="PMC">000608</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a" type="main">Which adults in the Paris metropolitan area have never been tested for HIV? A 2010 multilevel, cross-sectional, population-based study</title><author><name sortKey="Massari, Veronique" sort="Massari, Veronique" uniqKey="Massari V" first="Véronique" last="Massari">Véronique Massari</name><affiliation><nlm:aff id="Aff1">Sorbonne Universités, UPMC Univ Paris 06, INSERM, Institut Pierre Louis Institute d’Epidémiologie et de Santé Publique (IPLESP UMRS 1136), Department of Social Epidemiology, F-75012 Paris, France</nlm:aff></affiliation></author><author><name sortKey="Lapostolle, Annabelle" sort="Lapostolle, Annabelle" uniqKey="Lapostolle A" first="Annabelle" last="Lapostolle">Annabelle Lapostolle</name><affiliation><nlm:aff id="Aff1">Sorbonne Universités, UPMC Univ Paris 06, INSERM, Institut Pierre Louis Institute d’Epidémiologie et de Santé Publique (IPLESP UMRS 1136), Department of Social Epidemiology, F-75012 Paris, France</nlm:aff></affiliation></author><author><name sortKey="Grupposo, Marie Catherine" sort="Grupposo, Marie Catherine" uniqKey="Grupposo M" first="Marie-Catherine" last="Grupposo">Marie-Catherine Grupposo</name><affiliation><nlm:aff id="Aff1">Sorbonne Universités, UPMC Univ Paris 06, INSERM, Institut Pierre Louis Institute d’Epidémiologie et de Santé Publique (IPLESP UMRS 1136), Department of Social Epidemiology, F-75012 Paris, France</nlm:aff></affiliation></author><author><name sortKey="Dray Spira, Rosemary" sort="Dray Spira, Rosemary" uniqKey="Dray Spira R" first="Rosemary" last="Dray-Spira">Rosemary Dray-Spira</name><affiliation><nlm:aff id="Aff1">Sorbonne Universités, UPMC Univ Paris 06, INSERM, Institut Pierre Louis Institute d’Epidémiologie et de Santé Publique (IPLESP UMRS 1136), Department of Social Epidemiology, F-75012 Paris, France</nlm:aff></affiliation></author><author><name sortKey="Costagliola, Dominique" sort="Costagliola, Dominique" uniqKey="Costagliola D" first="Dominique" last="Costagliola">Dominique Costagliola</name><affiliation><nlm:aff id="Aff2">Sorbonne Universités, UPMC Univ Paris 06, INSERM, Institut Pierre Louis Institute d’Epidémiologie et de Santé Publique (IPLESP UMRS 1136), Department of HIV Clinical Research, F-75013 Paris, France</nlm:aff></affiliation></author><author><name sortKey="Chauvin, Pierre" sort="Chauvin, Pierre" uniqKey="Chauvin P" first="Pierre" last="Chauvin">Pierre Chauvin</name><affiliation><nlm:aff id="Aff1">Sorbonne Universités, UPMC Univ Paris 06, INSERM, Institut Pierre Louis Institute d’Epidémiologie et de Santé Publique (IPLESP UMRS 1136), Department of Social Epidemiology, F-75012 Paris, France</nlm:aff></affiliation></author></analytic><series><title level="j">BMC Infectious Diseases</title><idno type="eISSN">1471-2334</idno><imprint><date when="2015">2015</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en"><sec><title>Background</title><p>Despite the widespread offer of free HIV testing in France, the proportion of people who have never been tested remains high. The objective of this study was to identify, in men and women separately, the various factors independently associated with no lifetime HIV testing.</p></sec><sec><title>Methods</title><p>We used multilevel logistic regression models on data from the SIRS cohort, which included 3006 French-speaking adults as a representative sample of the adult population in the Paris metropolitan area in 2010. The lifetime absence of any HIV testing was studied in relation to individual demographic and socioeconomic factors, psychosocial characteristics, sexual biographies, HIV prevention behaviors, attitudes towards people living with HIV/AIDS (PLWHA), and certain neighborhood characteristics.</p></sec><sec><title>Results</title><p>In 2010, in the Paris area, men were less likely to have been tested for HIV at least once during their lifetime than women. In multivariate analysis, in both sexes, never having been tested was significantly associated with an age younger or older than the middle-age group (30–44 years), a low education level, a low self-perception of HIV risk, not knowing any PLWHA, a low lifetime number of couple relationships, and the absence of any history of STIs. In women, other associated factors were not having a child <20 years of age, not having additional health insurance, having had no or only one sexual partner in the previous 5 years, living in a cohabiting couple or having no relationship at the time of the survey, and a feeling of belonging to a community. Men with specific health insurance for low-income individuals were less likely to have never been tested, and those with a high stigma score towards PLWHA were more likely to be never-testers.</p><p>Our study also found neighborhood differences in the likelihood of men never having been tested, which was, at least partially, explained by the neighborhood proportion of immigrants. In contrast, in women, no contextual variable was significantly associated with never-testing for HIV after adjustment for individual characteristics.</p></sec><sec><title>Conclusions</title><p>Studies such as this one can help target people who have never been tested in the context of recommendations for universal HIV screening in primary care.</p></sec></div></front><back><div1 type="bibliography"><listBibl><biblStruct><analytic><author><name sortKey="De Wit, Jb" uniqKey="De Wit J">JB De Wit</name></author><author><name sortKey="Adam, Pc" uniqKey="Adam P">PC Adam</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Deblonde, J" uniqKey="Deblonde J">J Deblonde</name></author><author><name sortKey="De Koker, P" uniqKey="De Koker P">P de Koker</name></author><author><name sortKey="Hamers, Ff" uniqKey="Hamers F">FF Hamers</name></author><author><name sortKey="Fontaine, J" uniqKey="Fontaine J">J Fontaine</name></author><author><name sortKey="Luchters, S" 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<front><journal-meta><journal-id journal-id-type="nlm-ta">BMC Infect Dis</journal-id><journal-id journal-id-type="iso-abbrev">BMC Infect. Dis</journal-id><journal-title-group><journal-title>BMC Infectious Diseases</journal-title></journal-title-group><issn pub-type="epub">1471-2334</issn><publisher><publisher-name>BioMed Central</publisher-name><publisher-loc>London</publisher-loc></publisher></journal-meta><article-meta><article-id pub-id-type="pmid">26198690</article-id><article-id pub-id-type="pmc">4509770</article-id><article-id pub-id-type="publisher-id">1006</article-id><article-id pub-id-type="doi">10.1186/s12879-015-1006-9</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group></article-categories><title-group><article-title>Which adults in the Paris metropolitan area have never been tested for HIV? A 2010 multilevel, cross-sectional, population-based study</article-title></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><name><surname>Massari</surname><given-names>Véronique</given-names></name><address><email>veronique.massari@iplesp.upmc.fr</email></address><xref ref-type="aff" rid="Aff1"></xref></contrib><contrib contrib-type="author"><name><surname>Lapostolle</surname><given-names>Annabelle</given-names></name><address><email>annabelle.lapostolle@iplesp.upmc.fr</email></address><xref ref-type="aff" rid="Aff1"></xref></contrib><contrib contrib-type="author"><name><surname>Grupposo</surname><given-names>Marie-Catherine</given-names></name><address><email>marie-catherine.grupposo@iplesp.upmc.fr</email></address><xref ref-type="aff" rid="Aff1"></xref></contrib><contrib contrib-type="author"><name><surname>Dray-Spira</surname><given-names>Rosemary</given-names></name><address><email>rosemary.dray-spira@iplesp.upmc.fr</email></address><xref ref-type="aff" rid="Aff1"></xref></contrib><contrib contrib-type="author"><name><surname>Costagliola</surname><given-names>Dominique</given-names></name><address><email>dominique.costagliola@iplesp.upmc.fr</email></address><xref ref-type="aff" rid="Aff2"></xref></contrib><contrib contrib-type="author"><name><surname>Chauvin</surname><given-names>Pierre</given-names></name><address><email>pierre.chauvin@iplesp.upmc.fr</email></address><xref ref-type="aff" rid="Aff1"></xref></contrib><aff id="Aff1"><label></label>Sorbonne Universités, UPMC Univ Paris 06, INSERM, Institut Pierre Louis Institute d’Epidémiologie et de Santé Publique (IPLESP UMRS 1136), Department of Social Epidemiology, F-75012 Paris, France</aff><aff id="Aff2"><label></label>Sorbonne Universités, UPMC Univ Paris 06, INSERM, Institut Pierre Louis Institute d’Epidémiologie et de Santé Publique (IPLESP UMRS 1136), Department of HIV Clinical Research, F-75013 Paris, France</aff></contrib-group><pub-date pub-type="epub"><day>22</day><month>7</month><year>2015</year></pub-date><pub-date pub-type="pmc-release"><day>22</day><month>7</month><year>2015</year></pub-date><pub-date pub-type="collection"><year>2015</year></pub-date><volume>15</volume><elocation-id>278</elocation-id><history><date date-type="received"><day>2</day><month>4</month><year>2015</year></date><date date-type="accepted"><day>1</day><month>7</month><year>2015</year></date></history><permissions><copyright-statement>© Massari 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"><sec><title>Background</title><p>Despite the widespread offer of free HIV testing in France, the proportion of people who have never been tested remains high. The objective of this study was to identify, in men and women separately, the various factors independently associated with no lifetime HIV testing.</p></sec><sec><title>Methods</title><p>We used multilevel logistic regression models on data from the SIRS cohort, which included 3006 French-speaking adults as a representative sample of the adult population in the Paris metropolitan area in 2010. The lifetime absence of any HIV testing was studied in relation to individual demographic and socioeconomic factors, psychosocial characteristics, sexual biographies, HIV prevention behaviors, attitudes towards people living with HIV/AIDS (PLWHA), and certain neighborhood characteristics.</p></sec><sec><title>Results</title><p>In 2010, in the Paris area, men were less likely to have been tested for HIV at least once during their lifetime than women. In multivariate analysis, in both sexes, never having been tested was significantly associated with an age younger or older than the middle-age group (30–44 years), a low education level, a low self-perception of HIV risk, not knowing any PLWHA, a low lifetime number of couple relationships, and the absence of any history of STIs. In women, other associated factors were not having a child <20 years of age, not having additional health insurance, having had no or only one sexual partner in the previous 5 years, living in a cohabiting couple or having no relationship at the time of the survey, and a feeling of belonging to a community. Men with specific health insurance for low-income individuals were less likely to have never been tested, and those with a high stigma score towards PLWHA were more likely to be never-testers.</p><p>Our study also found neighborhood differences in the likelihood of men never having been tested, which was, at least partially, explained by the neighborhood proportion of immigrants. In contrast, in women, no contextual variable was significantly associated with never-testing for HIV after adjustment for individual characteristics.</p></sec><sec><title>Conclusions</title><p>Studies such as this one can help target people who have never been tested in the context of recommendations for universal HIV screening in primary care.</p></sec></abstract><kwd-group xml:lang="en"><title>Keywords</title><kwd>HIV</kwd><kwd>Sexual behavior</kwd><kwd>Prevention</kwd><kwd>Gender</kwd><kwd>Multilevel</kwd><kwd>Cross-sectional studies</kwd><kwd>Social inequalities</kwd><kwd>Immigration status</kwd><kwd>Neighborhood</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>Background</title><p>In high-income countries, publications on the barriers to and/or the facilitators of HIV testing remain scarce [<xref ref-type="bibr" rid="CR1">1</xref>, <xref ref-type="bibr" rid="CR2">2</xref>], especially those focusing on the situation of their immigrant populations [<xref ref-type="bibr" rid="CR3">3</xref>–<xref ref-type="bibr" rid="CR7">7</xref>]. In France, because of the legal restrictions on collecting and processing data on ethnicity, religion and immigration status, there are few studies on the social and migrational determinants of HIV testing [<xref ref-type="bibr" rid="CR8">8</xref>–<xref ref-type="bibr" rid="CR10">10</xref>].</p><p>Despite universal access to HIV screening and treatment and one of the highest annual HIV testing rates in Europe (103 per 1,000 inhabitants) [<xref ref-type="bibr" rid="CR11">11</xref>], the Paris region is characterized by a high proportion of HIV-positive tests (4.5 per 1,000 tests) and a large number of people who are unaware of their HIV infection (estimated at around 13,000 in a regional population of 11.9 million people) [<xref ref-type="bibr" rid="CR12">12</xref>, <xref ref-type="bibr" rid="CR13">13</xref>]. In this context, new screening strategies have been considered, which consist not only in promoting regular testing of high-risk individuals, but also in increasing the uptake of HIV screening by people who have never been tested. Indeed, in the past 5 years, the percentage of never-testers has decreased significantly but is still significant in this region. In 2010, a regional KABP survey found that 33.9 % of men and 21.5 % of women aged 18–54 years had never been tested during their lifetime (these proportions were 47.0 % and 33.6 % in 2004, respectively) [<xref ref-type="bibr" rid="CR11">11</xref>]. The regional incidence of AIDS is estimated to be approximately 1,500 cases each year. In 2010, 60 % of them were unaware of their HIV status at the time of diagnosis, and 40 % had never been tested [<xref ref-type="bibr" rid="CR14">14</xref>].</p><p>Our objectives were to collect certain socioeconomic status indicators, origin, sexual biographies, attitudes and behaviors regarding HIV testing and prevention, and neighborhood characteristics, in a representative sample of the adult, French-speaking population in the Paris metropolitan area and to determine those associated with no lifetime uptake of HIV testing.</p></sec><sec id="Sec2" sec-type="materials|methods"><title>Methods</title><p>The SIRS (a French acronym for health, inequalities and social ruptures) cohort is the first large, representative, population-based cohort created to study the social determinants of health and health-care utilization in the field of social epidemiology in France [<xref ref-type="bibr" rid="CR15">15</xref>, <xref ref-type="bibr" rid="CR16">16</xref>]. In 2005, at inclusion, our study population was a multistage random sample of the adult French-speaking population living in the Paris metropolitan area (also called “Greater Paris”, consisting of the City of Paris and its three adjacent <italic>départements</italic>, which constitute the core area of the entire Paris region, with 6.6 million inhabitants). The primary sampling units were census blocks including about 2000 inhabitants each. Fifty of them were randomly selected from the 2595 eligible census blocks according to their socioeconomic type. Subsequently, 60 households in each census block were chosen at random. Lastly, one adult in each household was randomly selected by the next-birthday method and interviewed at home.</p><p>In 2010, 47.2 % of the 3006 participants included in 2005 were reinterviewed (2.6 % were deceased, 1.8 % were too sick to answer our questions, 13.9 % had moved out of the 50 surveyed IRISs, 2.7 % were absent during the survey period, 18.4 % declined to participate, and 13.4 % were lost to follow-up). Their sex ratio and mean age were similar to those of the individuals who were not reinterviewed. The individuals lost to follow-up were younger and better off than the others, but neither their health status nor the socioeconomic type of their census block of residence was different. Those absent during the survey period had a lower socioeconomic status and were mostly immigrants. In each census block, the individuals who were not reinterviewed in 2010 were replaced by means of a random procedure similar to the one used in 2005, up to a final sample size of 60 adults interviewed per census block. The refusal rate among the newly contacted individuals was 29 % (the same as in 2005).</p><p>In this paper, data collected in 2010 were examined cross-sectionally. The independent variables were selected from the SIRS dataset for the relevance of their association with HIV testing [<xref ref-type="bibr" rid="CR17">17</xref>] or, more generally, with preventive health-care activities [<xref ref-type="bibr" rid="CR18">18</xref>]. The analyses were limited to the 2621 subjects under 70 years of age to avoid a possible memory bias in the older individuals and to compare our data with those from other French studies.</p><sec id="Sec3"><title>Ethics</title><p>This cohort study had received legal authorization from two national authorities for non-biomedical research [<xref ref-type="bibr" rid="CR19">19</xref>]: the <italic>Comité consultatif sur le traitement de l’information en matière de recherche dans le domaine de la santé</italic> (CCTIRS) (authorization number 904251) and the <italic>Commission nationale de l’informatique et des libertés</italic> (CNIL) (authorization number 05-1024). The participants provide their verbal informed consent. Written consent was not necessary because this survey did not fall into the category of biomedical research (as defined by French law) and did not collect any personal identification data.</p></sec><sec id="Sec4"><title>Measures</title><sec id="Sec5"><title>Outcome</title><p>The outcome variable was no lifetime HIV testing.</p></sec><sec id="Sec6"><title>Demographics</title><p>A first set of independent variables examined in this study consisted of demographics, which included age and ‘immigration status’. The latter was defined and categorized on the basis of both the individual’s and his/her parents’ nationality (at the time of the survey or of their death), distinguishing between French, born to two French parents; French, born to at least one foreign parent; and foreigners. Because HIV screening for all pregnant women had been widely offered since 1990 in France [<xref ref-type="bibr" rid="CR20">20</xref>], having a child <20 years of age (or being pregnant at the time of the survey) was also considered.</p></sec><sec id="Sec7"><title>Socioeconomic status</title><p>(SES)<bold>-</bold> Several characteristics related to the participants’ SES were taken into account: education level (none or primary school, secondary school, and postsecondary), employment status (actively employed vs. all others, including unemployed, retired, student and inactive), occupational category (coded as never having worked, blue-collar, tradespeople/salespeople/shopkeepers and intermediate occupation, lower white-collar, and upper white-collar), and monthly income per consumption unit (CU), as calculated according to the OECD scale [<xref ref-type="bibr" rid="CR21">21</xref>].</p></sec><sec id="Sec8"><title>Health care utilization status</title><p>This dimension was explored by examining two variables: health insurance status and having or not having a regular general practitioner.</p></sec><sec id="Sec9"><title>HIV risk and stigma</title><p>The participants’ self-perception of HIV risk (ranked as low or high) and their knowing or not knowing people living with HIV/AIDS were taken into account. Five questions regarding attitudes towards PLWHA (namely, would accept to 1) work with them, 2) have a meal at their home, 3) go on vacation with them, 4) have protected sex with them, and 5) let them look after their children or grandchildren) were combined to calculate a stigma score, which ranged from 0 and 10 and increased with the level of negative attitude towards PLWHA. For each gender, this score was dichotomized into two categories (≤ or > 2, i.e., the mean score value for the entire population and also by gender).</p></sec><sec id="Sec10"><title>Sexual biographies, attitudes and behaviors</title><p>The following variables were taken into account: self-reported sexual orientation (homosexual or bisexual, heterosexual, and not answered), the number of sexual partners of each sex, the number of sexual partnerships during the previous 5 years (one partnership, multiple partnerships or no partnerships), couple status at the time of the survey (no relationship, love affair, non-cohabiting couple or cohabiting couple), and the lifetime number of couple relationships. The interviewees were also asked about their STI history (with a single question: “Have you ever had an STI?”, with no further details).</p></sec><sec id="Sec11"><title>Social integration</title><p>Certain characteristics pertaining to the participants’ social ties and social support were taken into consideration as well: a feeling of being supported (or of not being supported) by friends, relatives or neighbors (“social support” in the rest of this paper), living (or not) living alone, a sense of belonging to a community, and their religious affiliation and practice, if any (but not their religion per se, as this would not have been very acceptable in France).</p></sec><sec id="Sec12"><title>Neighborhood characteristics</title><p>At the neighborhood level, four socioeconomic characteristics of the census blocks of residence were considered. The mean monthly household income was calculated using the 2007 income tax database (provided by French tax authorities) and divided into quartiles. The proportions of immigrants, unemployed residents, and people with a low education level (no education or primary school) were available in the 2007 population census data provided by the French National Institute of Statistics and Economic Studies.</p></sec></sec><sec id="Sec13"><title>Statistical analyses</title><p>The differences in characteristics among the participants who reported having been tested at least once for HIV and those who had not were investigated using χ<sup>2</sup> analysis or the Fisher exact test. Since sexual biographies, attitudes and behaviors vary according to gender [<xref ref-type="bibr" rid="CR22">22</xref>, <xref ref-type="bibr" rid="CR23">23</xref>], all the analyses were stratified by sex. All of the univariate statistical analyses were weighted to take into account the sampling method and the poststratification adjustment for age and gender according to the 2007 general population census data [<xref ref-type="bibr" rid="CR16">16</xref>]. A two-sided <italic>p</italic>-value <0.05 was considered statistically significant.</p><p>To build the final model for each sex, we used the following modeling strategy. First, a null model was computed to estimate the area-level variations without any covariables. Second, we considered three groups of independent variables (1. demographics and SES; 2. the other individual variables, i.e., those concerning HIV risk and stigma toward PLWHA, sexual biographies, attitudes and behaviors, and social integration; and 3. the neighborhood variables) and performed a preselection of the independent variables associated with our outcome in each of these groups. To do this, all the variables associated with our dependant variable with a <italic>p</italic>-value <0.20 in univariate analysis (Table <xref rid="Tab1" ref-type="table">1</xref>) were selected manually (using a backward-selection procedure based on the Hosmer & Lemeshow approach [<xref ref-type="bibr" rid="CR24">24</xref>] with a threshold <italic>p</italic> < 0.10) and checking for multicollinearity. Third, in Model 1, only the preselected demographic and socioeconomic variables were included and further selected using the same procedure but with a threshold <italic>p</italic> < 0.05. Fourth, in Model 2, the other individual variables previously preselected were added to Model 1 and backward-selected with a threshold <italic>p</italic> < 0.05. Finally, all the contextual variables were added to Model 2 and selected in Model 3 in the same manner. Since no neighbourhood variable was found to be significantly associated in women, the final model was Model 2 (Table <xref rid="Tab3" ref-type="table">3</xref>).<table-wrap id="Tab1"><label>Table 1</label><caption><p>Comparison of the characteristics of the HIV-tested and never-tested men (<italic>n</italic> = 1261) and women (<italic>n</italic> = 1360) in 2010</p></caption><table frame="hsides" rules="groups"><thead><tr><th></th><th>Overall (<italic>n</italic> = 2621)</th><th>%</th><th>Never-tested men (<italic>n</italic> = 537)</th><th>%</th><th><italic>P</italic>-value (tested vs. never-tested)</th><th>Never-tested women (<italic>n</italic> = 451)</th><th>%</th><th><italic>P</italic>-value (tested vs. never-tested)</th></tr></thead><tbody><tr><td>Age</td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>18–29 years</td><td>655</td><td char="." align="char">25.0</td><td>162/332</td><td char="." align="char">48.7</td><td char="." align="char"><.0001</td><td>133/323</td><td char="." align="char">41.3</td><td char="." align="char"><.0001</td></tr><tr><td>30–44 years</td><td>959</td><td char="." align="char">36.6</td><td>144/455</td><td char="." align="char">31.6</td><td></td><td>78/504</td><td char="." align="char">15.5</td><td></td></tr><tr><td>45–59 years</td><td>700</td><td char="." align="char">26.7</td><td>143/332</td><td char="." align="char">43.0</td><td></td><td>140/367</td><td char="." align="char">38.1</td><td></td></tr><tr><td>60–69 years</td><td>308</td><td char="." align="char">11.7</td><td>89/142</td><td char="." align="char">63.0</td><td></td><td>99/166</td><td char="." align="char">59.8</td><td></td></tr><tr><td>Immigration status</td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>French/French parents</td><td>1688</td><td char="." align="char">64.4</td><td>329/832</td><td char="." align="char">39.5</td><td char="." align="char">.0031</td><td>257/856</td><td char="." align="char">30.0</td><td char="." align="char">.001</td></tr><tr><td>French/foreign parent (s)</td><td>544</td><td char="." align="char">20.7</td><td>116/243</td><td char="." align="char">48.0</td><td></td><td>111/301</td><td char="." align="char">36.7</td><td></td></tr><tr><td>Foreigners</td><td>389</td><td char="." align="char">14.8</td><td>92/187</td><td char="." align="char">49.4</td><td></td><td>83/203</td><td char="." align="char">40.9</td><td></td></tr><tr><td>Children and pregnancy</td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>No child under 20 years of age</td><td>1921</td><td char="." align="char">73.3</td><td>514/1201</td><td char="." align="char">42.8</td><td char="." align="char">.5360</td><td>333/720</td><td char="." align="char">46.3</td><td char="." align="char"><.0001</td></tr><tr><td>Child under 20 years of age<sup>a</sup></td><td>701</td><td char="." align="char">26.7</td><td>23/60</td><td char="." align="char">38.8</td><td></td><td>118/640</td><td char="." align="char">18.4</td><td></td></tr><tr><td>Education level</td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>None or primary school</td><td>145</td><td char="." align="char">5.6</td><td>52/75</td><td char="." align="char">68.8</td><td char="." align="char"><.0001</td><td>50/70</td><td char="." align="char">71.3</td><td char="." align="char"><.0001</td></tr><tr><td>Secondary school</td><td>941</td><td char="." align="char">35.9</td><td>234/468</td><td char="." align="char">50.1</td><td></td><td>173/473</td><td char="." align="char">36.6</td><td></td></tr><tr><td>Postsecondary</td><td>1535</td><td char="." align="char">58.4</td><td>251/718</td><td char="." align="char">35.0</td><td></td><td>228/817</td><td char="." align="char">27.9</td><td></td></tr><tr><td>Employment status</td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Actively employed</td><td>1940</td><td char="." align="char">74.0</td><td>386/1012</td><td char="." align="char">38.1</td><td char="." align="char"><.0001</td><td>233/928</td><td char="." align="char">25.1</td><td char="." align="char"><.0001</td></tr><tr><td>All others</td><td>682</td><td char="." align="char">26.0</td><td>151/249</td><td char="." align="char">60.7</td><td></td><td>218/432</td><td char="." align="char">50.4</td><td></td></tr><tr><td>Socio-occupational category</td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Never worked</td><td>249</td><td char="." align="char">9.5</td><td>63/83</td><td char="." align="char">76.4</td><td char="." align="char"><.0001</td><td>91/166</td><td char="." align="char">54.9</td><td char="." align="char"><.0001</td></tr><tr><td>Blue collar</td><td>190</td><td char="." align="char">7.2</td><td>88/162</td><td char="." align="char">54.0</td><td></td><td>13/27</td><td char="." align="char">48.8</td><td></td></tr><tr><td>Lower white-collar</td><td>948</td><td char="." align="char">36.2</td><td>147/362</td><td char="." align="char">40.7</td><td></td><td>202/586</td><td char="." align="char">34.5</td><td></td></tr><tr><td>Tradespeople, salespeople</td><td>479</td><td char="." align="char">18.1</td><td>93/238</td><td char="." align="char">39.2</td><td></td><td>74/237</td><td char="." align="char">22.2</td><td></td></tr><tr><td>Upper white-collar</td><td>758</td><td char="." align="char">28.9</td><td>146/416</td><td char="." align="char">35.1</td><td></td><td>70/342</td><td char="." align="char">20.5</td><td></td></tr><tr><td>Monthly income (€/CU)</td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>First quartile (< 1100)</td><td>652</td><td char="." align="char">24.9</td><td>150/305</td><td char="." align="char">49.2</td><td char="." align="char">.0002</td><td>143/347</td><td char="." align="char">41.4</td><td char="." align="char">.0010</td></tr><tr><td>Second quartile (1100–1700)</td><td>663</td><td char="." align="char">25.3</td><td>142/304</td><td char="." align="char">46.8</td><td></td><td>113/359</td><td char="." align="char">31.5</td><td></td></tr><tr><td>Third quartile (1701–2500)</td><td>657</td><td char="." align="char">25.1</td><td>130/333</td><td char="." align="char">39.0</td><td></td><td>84/324</td><td char="." align="char">27.3</td><td></td></tr><tr><td>Fourth quartile (≥2501)</td><td>649</td><td char="." align="char">24.8</td><td>115/319</td><td char="." align="char">36.1</td><td></td><td>106/330</td><td char="." align="char">32.1</td><td></td></tr><tr><td>Health insurance status</td><td>final</td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>HI + additional insurance</td><td>2104</td><td char="." align="char">80.4</td><td>416/976</td><td char="." align="char">42.6</td><td char="." align="char">0.0380</td><td>345/1128</td><td char="." align="char">30.6</td><td char="." align="char"><0.0001</td></tr><tr><td>HI for the poor</td><td>178</td><td char="." align="char">6.8</td><td>27/86</td><td char="." align="char">31.4</td><td></td><td>36/92</td><td char="." align="char">39.1</td><td></td></tr><tr><td>HI with no additional insurance</td><td>335</td><td char="." align="char">12.8</td><td>94/198</td><td char="." align="char">47.5</td><td></td><td>66/137</td><td char="." align="char">48.2</td><td></td></tr><tr><td>Self-perception of HIV risk</td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>High</td><td>708</td><td char="." align="char">27.0</td><td>73/349</td><td char="." align="char">20.9</td><td char="." align="char"><.0001</td><td>49/359</td><td char="." align="char">13.7</td><td char="." align="char"><.0001</td></tr><tr><td>Low</td><td>1913</td><td char="." align="char">73.0</td><td>465/912</td><td char="." align="char">51.0</td><td></td><td>402/1001</td><td char="." align="char">40.1</td><td></td></tr><tr><td>Knowing PLWHA</td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Yes</td><td>1650</td><td char="." align="char">63.0</td><td>396/807</td><td char="." align="char">49.1</td><td char="." align="char"><.0001</td><td>341/844</td><td char="." align="char">40.4</td><td char="." align="char"><.0001</td></tr><tr><td>No</td><td>971</td><td char="." align="char">37.0</td><td>141/455</td><td char="." align="char">31.1</td><td></td><td>110/516</td><td char="." align="char">21.3</td><td></td></tr><tr><td>Stigma towards PLWHA</td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Score ≤ 2</td><td>1740</td><td char="." align="char">66.4</td><td>320/840</td><td char="." align="char">38.1</td><td char="." align="char"><.0001</td><td>267/900</td><td char="." align="char">29.7</td><td char="." align="char">.0002</td></tr><tr><td>Score > 2</td><td>882</td><td char="." align="char">33.6</td><td>217/421</td><td char="." align="char">51.6</td><td></td><td>184/460</td><td char="." align="char">39.9</td><td></td></tr><tr><td>Self-reported sexual orientation</td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Heterosexual</td><td>2515</td><td char="." align="char">95.9</td><td>522/1190</td><td char="." align="char">43.9</td><td char="." align="char"><.0001</td><td>435/1325</td><td char="." align="char">32.9</td><td char="." align="char"><.0001</td></tr><tr><td>Homo/bisexual</td><td>75</td><td char="." align="char">2.9</td><td>6/58</td><td char="." align="char">10.2</td><td></td><td>1/16</td><td char="." align="char">9.4</td><td></td></tr><tr><td>Not answered</td><td>31</td><td char="." align="char">1.2</td><td>10/13</td><td char="." align="char">76.9</td><td></td><td>14/19</td><td char="." align="char">74.9</td><td></td></tr><tr><td>Sexual partnerships during the previous 5 years</td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>No partnerships</td><td>243</td><td char="." align="char">9.3</td><td>43/84</td><td char="." align="char">51.9</td><td char="." align="char"><.0001</td><td>99/159</td><td char="." align="char">61.9</td><td char="." align="char"><.0001</td></tr><tr><td>One partnership</td><td>1638</td><td char="." align="char">62.5</td><td>336/712</td><td char="." align="char">47.2</td><td></td><td>302/926</td><td char="." align="char">32.6</td><td></td></tr><tr><td>Multiple partnerships</td><td>740</td><td char="." align="char">28.2</td><td>158/465</td><td char="." align="char">33.9</td><td></td><td>50/274</td><td char="." align="char">18.1</td><td></td></tr><tr><td>Couple status at the time of the survey</td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Not in a relationship</td><td>569</td><td char="." align="char">21.7</td><td>143/279</td><td char="." align="char">51.5</td><td char="." align="char"><.0001</td><td>132/290</td><td char="." align="char">45.7</td><td char="." align="char"><.0001</td></tr><tr><td>Love affair</td><td>335</td><td char="." align="char">12.8</td><td>50/157</td><td char="." align="char">32.0</td><td></td><td>59/178</td><td char="." align="char">32.9</td><td></td></tr><tr><td>Non-cohabiting couple</td><td>156</td><td char="." align="char">5.9</td><td>21/82</td><td char="." align="char">25.5</td><td></td><td>15/73</td><td char="." align="char">20.3</td><td></td></tr><tr><td>Cohabiting couple</td><td>1562</td><td char="." align="char">59.6</td><td>323/743</td><td char="." align="char">43.4</td><td></td><td>245/818</td><td char="." align="char">29.9</td><td></td></tr><tr><td>Lifetime number of couple relationships</td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>None</td><td>556</td><td char="." align="char">21.2</td><td>160/320</td><td char="." align="char">50.0</td><td char="." align="char"><.0001</td><td>116/237</td><td char="." align="char">49.0</td><td char="." align="char"><.0001</td></tr><tr><td>One</td><td>1317</td><td char="." align="char">50.3</td><td>285/565</td><td char="." align="char">50.5</td><td></td><td>268/753</td><td char="." align="char">35.6</td><td></td></tr><tr><td>≥ 2</td><td>747</td><td char="." align="char">28.5</td><td>92/377</td><td char="." align="char">24.5</td><td></td><td>67/370</td><td char="." align="char">18.0</td><td></td></tr><tr><td>History of STI</td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>No</td><td>2260</td><td char="." align="char">86.2</td><td>513/1113</td><td char="." align="char">46.1</td><td char="." align="char"><.0001</td><td>409/1147</td><td char="." align="char">35.7</td><td char="." align="char"><.0001</td></tr><tr><td>Yes</td><td>361</td><td char="." align="char">13.8</td><td>24/148</td><td char="." align="char">16.4</td><td></td><td>42/213</td><td char="." align="char">19.5</td><td></td></tr><tr><td>Feeling of being supported</td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Yes</td><td>2597</td><td char="." align="char">99.1</td><td>533/1248</td><td char="." align="char">42.7</td><td char="." align="char">0.561</td><td>443/1349</td><td char="." align="char">32.8</td><td char="." align="char">0.0082</td></tr><tr><td>No</td><td>24.5</td><td char="." align="char">0.9</td><td>5/14</td><td char="." align="char">35.7</td><td></td><td>8/11</td><td char="." align="char">72.7</td><td></td></tr><tr><td>Living alone</td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Yes</td><td>414</td><td char="." align="char">15.8</td><td>75/223</td><td char="." align="char">33.6</td><td char="." align="char">0.002</td><td>73/190</td><td char="." align="char">38.4</td><td char="." align="char">0.1077</td></tr><tr><td>No</td><td>2207</td><td char="." align="char">84.2</td><td>463/1038</td><td char="." align="char">44.6</td><td></td><td>378/1169</td><td char="." align="char">32.3</td><td></td></tr><tr><td>Sense of belonging to a community</td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>No</td><td>1806</td><td char="." align="char">68.9</td><td>347/872</td><td char="." align="char">39.8</td><td char="." align="char">.0024</td><td>273/934</td><td char="." align="char">29.3</td><td char="." align="char"><.0001</td></tr><tr><td>Yes</td><td>815</td><td char="." align="char">31.1</td><td>191/390</td><td char="." align="char">48.9</td><td></td><td>177/426</td><td char="." align="char">41.7</td><td></td></tr><tr><td>Practice of a religion</td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Practices a religion regularly</td><td>492</td><td char="." align="char">18.8</td><td>86/183</td><td char="." align="char">47.1</td><td char="." align="char">.1313</td><td>136/309</td><td char="." align="char">44.0</td><td char="." align="char"><.0001</td></tr><tr><td>Practices a religion but not on a regular basis</td><td>483</td><td char="." align="char">18.4</td><td>85/199</td><td char="." align="char">42.8</td><td></td><td>97/284</td><td char="." align="char">34.3</td><td></td></tr><tr><td>Affiliation but does not practice</td><td>699</td><td char="." align="char">26.7</td><td>154/353</td><td char="." align="char">43.6</td><td></td><td>101/346</td><td char="." align="char">29.1</td><td></td></tr><tr><td>No practicing or affiliation</td><td>949</td><td char="." align="char">36.2</td><td>212/526</td><td char="." align="char">40.4</td><td></td><td>117/422</td><td char="." align="char">27.8</td><td></td></tr><tr><td>Neighborhood variables</td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Mean annual household income (€/CU)</td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>First quartile (< 17,000)</td><td>392</td><td char="." align="char">14.9</td><td>107/182</td><td char="." align="char">58.4</td><td char="." align="char"><.0001</td><td>81/209</td><td char="." align="char">38.8</td><td char="." align="char">.0026</td></tr><tr><td>Second quartile (17,000–21,999)</td><td>673</td><td char="." align="char">25.7</td><td>146/330</td><td char="." align="char">44.2</td><td></td><td>133/343</td><td char="." align="char">38.9</td><td></td></tr><tr><td>Third quartile (22,000–29,519)</td><td>776</td><td char="." align="char">29.6</td><td>157/375</td><td char="." align="char">41.8</td><td></td><td>112/401</td><td char="." align="char">28.0</td><td></td></tr><tr><td>Fourth quartile (≥ 29,520)</td><td>780</td><td char="." align="char">29.8</td><td>128/373</td><td char="." align="char">34.3</td><td></td><td>124/406</td><td char="." align="char">30.4</td><td></td></tr><tr><td>Proportion of immigrants</td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>First quartile</td><td>791</td><td char="." align="char">30.2</td><td>155/378</td><td char="." align="char">41.1</td><td char="." align="char">.0001</td><td>113/413</td><td char="." align="char">27.3</td><td char="." align="char">.0011</td></tr><tr><td>Second quartile</td><td>735</td><td char="." align="char">28.0</td><td>127/385</td><td char="." align="char">33.1</td><td></td><td>113/350</td><td char="." align="char">32.3</td><td></td></tr><tr><td>Third quartile</td><td>585</td><td char="." align="char">22.3</td><td>111/257</td><td char="." align="char">43.3</td><td></td><td>124/327</td><td char="." align="char">38.0</td><td></td></tr><tr><td>Fourth quartile</td><td>511</td><td char="." align="char">19.5</td><td>143/241</td><td char="." align="char">59.4</td><td></td><td>101/269</td><td char="." align="char">37.4</td><td></td></tr><tr><td>Proportion of unemployed persons</td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>First quartile</td><td>707</td><td char="." align="char">27.0</td><td>130/334</td><td char="." align="char">39.0</td><td char="." align="char">.0003</td><td>112/373</td><td char="." align="char">29.9</td><td char="." align="char">.0008</td></tr><tr><td>Second quartile</td><td>835</td><td char="." align="char">31.9</td><td>156/399</td><td char="." align="char">39.2</td><td></td><td>134/436</td><td char="." align="char">30.7</td><td></td></tr><tr><td>Third quartile</td><td>622</td><td char="." align="char">23.7</td><td>143/315</td><td char="." align="char">45.5</td><td></td><td>98/306</td><td char="." align="char">32.0</td><td></td></tr><tr><td>Fourth quartile</td><td>457</td><td char="." align="char">17.4</td><td>107/213</td><td char="." align="char">50.3</td><td></td><td>107/244</td><td char="." align="char">44.0</td><td></td></tr><tr><td>Proportion of persons with a primary education or less</td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>First quartile</td><td>868</td><td char="." align="char">33.1</td><td>153/417</td><td char="." align="char">36.7</td><td char="." align="char">.0001</td><td>115/451</td><td char="." align="char">25.4</td><td char="." align="char">.0001</td></tr><tr><td>Second quartile</td><td>831</td><td char="." align="char">31.7</td><td>162/406</td><td char="." align="char">39.9</td><td></td><td>141/425</td><td char="." align="char">33.2</td><td></td></tr><tr><td>Third quartile</td><td>515</td><td char="." align="char">19.7</td><td>112/243</td><td char="." align="char">46.3</td><td></td><td>110/272</td><td char="." align="char">40.3</td><td></td></tr><tr><td>Fourth quartile</td><td>406</td><td char="." align="char">15.5</td><td>110/195</td><td char="." align="char">56.2</td><td></td><td>85/211</td><td char="." align="char">40.3</td><td></td></tr></tbody></table><table-wrap-foot><p><sup>a</sup> including 42 pregnant women</p></table-wrap-foot></table-wrap></p><p>For each characteristic, the category with the lowest number of never-testers was used as the reference in the multivariate models. All the analyses used STATA software (STATA® v.12; STATA College Station, TX) with the xtmelogit procedure (specifying that collected data were clustered by census block). At each step, the level 2 variance was estimated to test for area-level variation, and the median odds ratio (MOR) was calculated. The MOR measures the median value of the adjusted OR between the most and least at-risk individual when comparing all pairs of neighborhoods [<xref ref-type="bibr" rid="CR25">25</xref>].</p></sec></sec><sec id="Sec14" sec-type="results"><title>Results</title><sec id="Sec15"><title>Characteristics of the study population</title><p>The sample consisted of 1261 men (48.1 %) and 1360 women (51.9 %). The participants’ mean age (± SD) at the time of the interview was 41.6 (±15.4) years for the men and 42.3 (± 13.1) years for the women. With regard to SES (Table <xref rid="Tab1" ref-type="table">1</xref>), 58.4 % had a higher education level, 74.0 % were actively employed, 21.7 % were not in a couple relationship at the time of the survey, and 15.8 % were living alone. A sense of belonging to a community was shared by 31.1 % of the study population, and 37.2 % practiced a religion.</p><p>In 2010, 42.6 % (<italic>n</italic> = 537) of the men and 33.2 % (<italic>n</italic> = 451) of the women reported that they had never been tested for HIV during their lifetime. The men were more likely to have never been tested for HIV than the women (42.6 % vs. 33.2 %, <italic>p</italic> < 0.001). Of the 1639 (62.0 %) participants tested at least once in their lifetime, 56.8 % had been tested at least once at their request, 56.8 % during a systematic or routine examination (including pregnancy, marriage, blood donations and preop exams), and 20 % at their physician’s request. Of the participants who had been tested, 39.7 % had been so during the previous 24 months. The main reasons given for no testing were low risk perception (93 %), fear of HIV disease (3 %) and fear of HIV diagnosis disclosure (2 %).</p><p>The proportion of ever-testers varied greatly according to their neighborhood of residence, from 7.7 % (95 % CI: 0.0–19.6) to 85.7 % (95 % CI: 70.7–100.0) for the men, and from 19.3 % (95 % CI: 2.3–36.3) to 90.7 % (95 % CI: 80.1–100.0) for the women.</p></sec><sec id="Sec16"><title>Factors associated with no lifetime HIV testing in men</title><p>In the men (Table <xref rid="Tab1" ref-type="table">1</xref>), the factors associated with never-testing for HIV in univariate analysis were a young (<29 years) or an old age (>60 years), being a foreigner or a French person born to at least one foreign parent, a lower education level, not being actively employed, being a blue-collar worker or never having worked, a lower income, having no additional health insurance, a low self-perception of HIV risk, not knowing any PLWHA, a high stigma score towards PLWHA, perceiving oneself as heterosexual or not answered, having had no or only one sexual partner during the previous 5 years, not being in a couple relationship or living in a couple relationship at the time of the survey, having had no or only one couple relationship in one’s lifetime, not having a history of STIs, living alone, and the sense of belonging to a community. All the contextual variables tested were associated with the outcome. On the other hand, having a regular general practitioner, having social support and practicing a religion were not associated with no lifetime HIV testing in the men.</p><p>In multivariate multilevel analysis (Table <xref rid="Tab2" ref-type="table">2</xref>), an area-level effect was found in the null model (level 2 variance of 0.2898 [0.1087], <italic>p</italic> = 0.008). Model 1 (with demographic and socioeconomic variables) showed that the factors associated with no lifetime HIV testing were all the age groups, except 30–44 years, a low or an intermediate education level, never having worked, and health insurance status (having health insurance specifically for low-income individuals was associated with a lower likelihood of never having been tested than being insured through the usual system, with or without additional insurance). Introducing these characteristics reduced the level 2 variance by 14 %. In Model 2, the factors associated with our outcome included a low self-perception of HIV risk, a high stigma score towards PLWHA, not knowing any PLWHA, having had no or only one lifetime couple relationship, and not having a history of STIs. Introducing these characteristics led to a 53 % reduction in the initial level 2 variance. When further introducing neighborhood characteristics, only the proportion of immigrants in the neighborhood of residence was significant. In Model 3, the area-level variance (0.0978 [0.0803]) was no more significantly different from zero when both the individual and area-level variables were taken into account, and the MOR gradually decreased from 1.67 in the empty model to 1.35 in the full model.<table-wrap id="Tab2"><label>Table 2</label><caption><p>Factors associated with never-testing for HIV among men (<italic>n</italic> = 1261) as determined by multilevel multivariate logistic regression</p></caption><table frame="hsides" rules="groups"><thead><tr><th></th><th></th><th>Model 1</th><th>Model 2</th><th>Model 3</th></tr><tr><th></th><th></th><th>aOR [95 % CI]</th><th>aOR [95 % CI]</th><th>aOR [95 % CI]</th></tr></thead><tbody><tr><td>Individual variables</td><td></td><td></td><td></td><td></td></tr><tr><td>Age</td><td>18–29 years</td><td char="." align="char">2.07 [1.32–3.24]</td><td char="." align="char">1.88 [1.11–3.24]</td><td char="." align="char">1.86 [1.08–3.18]</td></tr><tr><td></td><td>30–44 years</td><td char="." align="char">Ref.</td><td char="." align="char">Ref.</td><td char="." align="char">Ref.</td></tr><tr><td></td><td>45–59 years</td><td char="." align="char">1.38 [0.97–1.96]</td><td char="." align="char">1.76 [1.20–2.58]</td><td char="." align="char">1.77 [1.21–2.59]</td></tr><tr><td></td><td>60–69 years</td><td char="." align="char">2.89 [1.88–4.42]</td><td char="." align="char">3.16 [1.98–5.04]</td><td char="." align="char">3.23 [2.02–5.14]</td></tr><tr><td>Education level</td><td></td><td></td><td></td><td></td></tr><tr><td></td><td>None or primary school</td><td char="." align="char">3.29 [1.83–5.94]</td><td char="." align="char">2.82 [1.49–5.33]</td><td char="." align="char">2.51 [1.32–4.78]</td></tr><tr><td></td><td>Secondary school</td><td char="." align="char">1.77 [1.24–2.51]</td><td char="." align="char">1.72 [1.18–2.52]</td><td char="." align="char">1.63 [1.11–2.39]</td></tr><tr><td></td><td>Postsecondary</td><td char="." align="char">Ref.</td><td char="." align="char">Ref.</td><td char="." align="char">Ref.</td></tr><tr><td>Socio-occupational category</td><td></td><td></td><td></td><td></td></tr><tr><td></td><td>Never worked</td><td char="." align="char">3. 33 [1.42–7.76]</td><td char="." align="char">3.62 [1.44–9.09]</td><td char="." align="char">3.34 [1.34–8.33]</td></tr><tr><td></td><td>Blue collar</td><td char="." align="char">1.24 [0.73–2.09]</td><td char="." align="char">1.06 [0.60–1.89]</td><td char="." align="char">0.99 [0.56–1.77]</td></tr><tr><td></td><td>Lower white-collar</td><td char="." align="char">0.81 [0.52–1.24]</td><td char="." align="char">0.74 [0.46–1.18]</td><td char="." align="char">069 [0.43–1.10]</td></tr><tr><td></td><td>Tradespeople, etc.</td><td char="." align="char">0.91 [0.59–1.40]</td><td char="." align="char">0.95 [0.60–1.52]</td><td char="." align="char">0.90 [0.56–1.44]</td></tr><tr><td></td><td>Upper white-collar</td><td char="." align="char">Ref.</td><td char="." align="char">Ref.</td><td char="." align="char">Ref.</td></tr><tr><td>Health insurance status</td><td></td><td></td><td></td><td></td></tr><tr><td></td><td>HI + additional insurance</td><td char="." align="char">2.30 [1.29–4.09]</td><td char="." align="char">2.23 [1.19–4.18]</td><td char="." align="char">2.34 [1.24–4.39]</td></tr><tr><td></td><td>HI for the poor</td><td char="." align="char">Ref.</td><td char="." align="char">Ref.</td><td char="." align="char">Ref.</td></tr><tr><td></td><td>HI with no additional insurance</td><td char="." align="char">2.43 [1.28–4.63]</td><td char="." align="char">2.43 [1.21–4.87]</td><td char="." align="char">2.46 [1.22–4.94]</td></tr><tr><td>Self-perception of HIV risk</td><td></td><td></td><td></td><td></td></tr><tr><td></td><td>High</td><td></td><td char="." align="char">Ref.</td><td char="." align="char">Ref.</td></tr><tr><td></td><td>Low</td><td></td><td char="." align="char">3.41 [2.29–5.08]</td><td char="." align="char">3.33 [2.24–4.96]</td></tr><tr><td>Knowing PLWHA</td><td></td><td></td><td></td><td></td></tr><tr><td></td><td>Yes</td><td></td><td char="." align="char">ref</td><td char="." align="char">ref</td></tr><tr><td></td><td>No</td><td></td><td char="." align="char">1.54 [1.09–2.18]</td><td char="." align="char">1.57 [1.12–2.22]</td></tr><tr><td>Stigma towards PLWHA</td><td></td><td></td><td></td><td></td></tr><tr><td></td><td>Score ≤ 2</td><td></td><td char="." align="char">Ref.</td><td char="." align="char">Ref.</td></tr><tr><td></td><td>Score > 2</td><td></td><td char="." align="char">1.70 [1.23–2.34]</td><td char="." align="char">1.67 [1.21–2.30]</td></tr><tr><td colspan="2">Lifetime number of couple relationships</td><td></td><td></td><td></td></tr><tr><td></td><td>None</td><td></td><td char="." align="char">2.96 [1.75–5.00]</td><td char="." align="char">2.97 [1.75–5.01]</td></tr><tr><td></td><td>One</td><td></td><td char="." align="char">2.19 [1.53–3.14]</td><td char="." align="char">2.16 [1.51–3.10]</td></tr><tr><td></td><td>≥ 2</td><td></td><td char="." align="char">Ref.</td><td char="." align="char">Ref.</td></tr><tr><td>History of STI</td><td></td><td></td><td></td><td></td></tr><tr><td></td><td>Yes</td><td></td><td char="." align="char">Ref.</td><td char="." align="char">Ref.</td></tr><tr><td></td><td>No</td><td></td><td char="." align="char">2.88 [1.64–5.07]</td><td char="." align="char">2.89 [1.65–5.06]</td></tr><tr><td>Neighborhood variables</td><td></td><td></td><td></td><td></td></tr><tr><td colspan="2">Proportion of immigrants</td><td></td><td></td><td></td></tr><tr><td></td><td>First quartile</td><td></td><td></td><td char="." align="char">1.04 [0.64–1.70]</td></tr><tr><td></td><td>Second quartile</td><td></td><td></td><td char="." align="char">ref</td></tr><tr><td></td><td>Third quartile</td><td></td><td></td><td char="." align="char">1.12 [0.68–1.85]</td></tr><tr><td></td><td>Fourth quartile</td><td></td><td></td><td char="." align="char">1.98 [1.18–3.33]</td></tr><tr><td>Level 2 variance</td><td></td><td char="." align="char">0.2495 (0.1064)</td><td char="." align="char">0.1545 (0.0942)</td><td char="." align="char">0.0978 (0.0803)</td></tr><tr><td><italic>p</italic>-value</td><td></td><td char="." align="char">0.019</td><td char="." align="char">0.101</td><td char="." align="char">0.223</td></tr><tr><td>MOR</td><td></td><td char="." align="char">1.61</td><td char="." align="char">1.45</td><td char="." align="char">1.35</td></tr></tbody></table><table-wrap-foot><p>Empty model: level 2 variance = 0.2898 (0.1087); <italic>p</italic> = 0.008; MOR = 1.67</p></table-wrap-foot></table-wrap></p></sec><sec id="Sec17"><title>Factors associated with no lifetime HIV testing in women</title><p>In the women (Table <xref rid="Tab1" ref-type="table">1</xref>), the factors positively associated with never-testing for HIV in univariate analysis were a younger (< 29 years) or an older age (> 60 years), being a foreigner or a French person born to at least one foreign parent, not having a child < 20 years of age, a low education level, not being actively employed, being a blue–collar worker or never having worked, a lower income, not having additional health insurance or having insurance for low-income individuals, a low self-perception of HIV risk, not knowing any PLWHA, a high stigma score towards PLWHA, being self-reported as heterosexual or not answered, having had no or only one sexual partner during the previous 5 years, not being in a couple relationship at the time of the survey, never having been in a couple relationship, not having a history of STIs, weak social support, a sense of belonging to a community, and practicing a religion on a regular basis. On the other hand, neither having a regular practitioner nor living alone was associated with never having been tested for HIV. All the contextual variables were significantly associated with the outcome.</p><p>In multivariate multilevel analysis (Table <xref rid="Tab3" ref-type="table">3</xref>), an area-level effect was found in the null model (area-level variance of 0.1864 [0.0698], <italic>p</italic> = 0.008). The following characteristics were selected in Model 1: the age groups other than 30–44 years, being a foreigner, not having a child < 20 years of age, a low or intermediate education level, not being actively employed, never having worked or being in an intermediate socio-occupational category, and not having additional health insurance. Introducing these characteristics reduced the level 2 variance by 38 %, and the area-level variance (0.1179 [0.0637]) was no more significantly different from zero. In Model 2, the attitudes and behavioral factors associated with never having been tested for HIV included a low self-perception of HIV risk, not knowing any PLWHA, a high stigma score towards PLWHA, having had no or only one sexual partner during the previous 5 years, not being in a couple relationship or being in a cohabiting couple relationship at the time of the survey, never having been in a couple relationship, not having a history of STIs, and a sense of belonging to a community. In the full model, the only neighborhood variable selected in the absence of any individual covariables (the neighborhood proportion of inhabitants with a low education level) was not significantly associated with the outcome. Overall, the successive adjustments had smaller impacts on level 2 variance and MOR in the woman than in the men.<table-wrap id="Tab3"><label>Table 3</label><caption><p>Factors associated with never-testing for HIV among women (<italic>n</italic> = 1360) as determined by multilevel multivariate logistic regression</p></caption><table frame="hsides" rules="groups"><thead><tr><th></th><th></th><th>Model 1</th><th>Model 2</th></tr><tr><th></th><th></th><th>aOR [95 % CI]</th><th>aOR [95 % CI]</th></tr></thead><tbody><tr><td>Individual variables</td><td></td><td></td><td></td></tr><tr><td>Age</td><td>18–29 years</td><td char="." align="char">1.70 [1.12–2.56]</td><td char="." align="char">1.66 [1.04–2.66]</td></tr><tr><td></td><td>30–44 years</td><td char="." align="char">Ref.</td><td char="." align="char">Ref.</td></tr><tr><td></td><td>45–59 years</td><td char="." align="char">2.15 [1.54–2.99]</td><td char="." align="char">2.18 [1.50–3.17]</td></tr><tr><td></td><td>60–69 years</td><td char="." align="char">2.55 [1.60–4.05]</td><td char="." align="char">2.69 [1.57–4.62]</td></tr><tr><td>Immigration status</td><td></td><td></td><td></td></tr><tr><td></td><td>French/French parents</td><td char="." align="char">Ref.</td><td char="." align="char">Ref.</td></tr><tr><td></td><td>French/foreign parent (s)</td><td char="." align="char">1.25 [0.91–1.73]</td><td char="." align="char">1.07 [0.75–1.55]</td></tr><tr><td></td><td>Foreigner</td><td char="." align="char">1.55 [1.06–2.27]</td><td char="." align="char">1.37 [0.89–2.10]</td></tr><tr><td>Child under 20 years of age</td><td></td><td></td><td></td></tr><tr><td></td><td>Yes</td><td char="." align="char">Ref.</td><td char="." align="char">Ref.</td></tr><tr><td></td><td>No</td><td char="." align="char">2.94 [2.17–3.99]</td><td char="." align="char">3.49 [2.41–5.07]</td></tr><tr><td>Education level</td><td></td><td></td><td></td></tr><tr><td></td><td>None or primary school</td><td char="." align="char">3.04 [1.77–5.23]</td><td char="." align="char">2.61 [1.45–4.71]</td></tr><tr><td></td><td>Secondary school</td><td char="." align="char">1.57 [1.15–2.12]</td><td char="." align="char">1.52 [1.08–2.13]</td></tr><tr><td></td><td>Post-secondary</td><td char="." align="char">Ref.</td><td char="." align="char">Ref.</td></tr><tr><td>Employment status</td><td></td><td></td><td></td></tr><tr><td></td><td>Actively employed</td><td char="." align="char">Ref.</td><td char="." align="char">Ref.</td></tr><tr><td></td><td>All others</td><td char="." align="char">1.54 [1.12–2.12]</td><td char="." align="char">1.11 [0.78–158]</td></tr><tr><td>Socio-occupational category</td><td></td><td></td><td></td></tr><tr><td></td><td>Never worked</td><td char="." align="char">2.39 [1.39–4.10]</td><td char="." align="char">1.81 [0.99–3.27]</td></tr><tr><td></td><td>Blue collar</td><td char="." align="char">1.28 [0.59–2.80]</td><td char="." align="char">1.02 [0.44–2.36]</td></tr><tr><td></td><td>Lower white-collar</td><td char="." align="char">1.30 [0.88–1.91]</td><td char="." align="char">1.12 [0.74–1.72]</td></tr><tr><td></td><td>Tradespeople, etc.</td><td char="." align="char">1.71 [1.15–2.54]</td><td char="." align="char">1.82 [1.18–2.80]</td></tr><tr><td></td><td>Upper white-collar</td><td char="." align="char">Ref.</td><td char="." align="char">Ref.</td></tr><tr><td>Health insurance status</td><td></td><td></td><td></td></tr><tr><td>HI + additional insurance</td><td>Ref.</td><td char="." align="char">Ref.</td><td></td></tr><tr><td></td><td>HI for the poor</td><td char="." align="char">0.95 [0.58–1.54]</td><td char="." align="char">1.29 [0.75–2.22]</td></tr><tr><td>HI with no additional insurance</td><td>1.72 [1.15–2.57]</td><td char="." align="char">2.09 [1.32–3.32]</td><td></td></tr><tr><td>Self-perception of HIV risk</td><td></td><td></td><td></td></tr><tr><td></td><td>High</td><td></td><td char="." align="char">Ref.</td></tr><tr><td></td><td>Low</td><td></td><td char="." align="char">5.04 [3.43–7.41]</td></tr><tr><td>Knowing PLWHA</td><td></td><td></td><td></td></tr><tr><td></td><td>Yes</td><td></td><td char="." align="char">Ref.</td></tr><tr><td></td><td>No</td><td></td><td char="." align="char">2.01 [1.49–2.71]</td></tr><tr><td>Sexual partnerships during previous 5 years</td><td></td><td></td><td></td></tr><tr><td></td><td>No partnerships</td><td></td><td char="." align="char">2.15 [1.26–3.67]</td></tr><tr><td></td><td>One partnership</td><td></td><td char="." align="char">1.73 [1.12–2.68]</td></tr><tr><td></td><td>Multiple partnerships</td><td></td><td char="." align="char">Ref.</td></tr><tr><td>Couple status at the time of the survey</td><td></td><td></td><td></td></tr><tr><td></td><td>No relationship</td><td></td><td char="." align="char">2.35 [1.15–4.78]</td></tr><tr><td></td><td>Love affair</td><td></td><td char="." align="char">2.03 [0.97–4.27]</td></tr><tr><td></td><td>Non-cohabiting couple</td><td></td><td char="." align="char">Ref.</td></tr><tr><td></td><td>Cohabiting couple</td><td></td><td char="." align="char">3.25 [1.57–6.72]</td></tr><tr><td>Lifetime number of couple relationships</td><td></td><td></td><td></td></tr><tr><td></td><td>None</td><td></td><td char="." align="char">2.63 [1.55–4.46]</td></tr><tr><td></td><td>One</td><td></td><td char="." align="char">1.39 [0.99–1.93]</td></tr><tr><td></td><td>≥ 2</td><td></td><td char="." align="char">Ref.</td></tr><tr><td>History of STI</td><td></td><td></td><td></td></tr><tr><td></td><td>No</td><td></td><td char="." align="char">1.62 [1.05–2.50]</td></tr><tr><td></td><td>Yes</td><td></td><td char="." align="char">Ref.</td></tr><tr><td>Sense of belonging to a community</td><td></td><td></td><td></td></tr><tr><td></td><td>Yes</td><td></td><td char="." align="char">1.33 [0.99–1.79]</td></tr><tr><td></td><td>No</td><td></td><td char="." align="char">Ref.</td></tr><tr><td>Level 2 variance</td><td></td><td char="." align="char">0.1179 (0.0637)</td><td char="." align="char">0.1655 (0.0804)</td></tr><tr><td><italic>P</italic>-value</td><td></td><td char="." align="char">0.064</td><td char="." align="char">0.039</td></tr><tr><td>MOR</td><td></td><td char="." align="char">1.39</td><td char="." align="char">1.47</td></tr></tbody></table><table-wrap-foot><p>Empty model: level 2 variance = 0.1864 (0.0698); <italic>p</italic> = 0.008; MOR = 1.51</p></table-wrap-foot></table-wrap></p></sec></sec><sec id="Sec18" sec-type="discussion"><title>Discussion</title><p>In addition to the socioeconomic factors usually observed to be associated with prevention attitudes and practices, we found that the absence of any lifetime HIV testing was associated with a low risk perception, health insurance status, not knowing any PLWHA, a high stigma score towards PLWHA, a low lifetime number of couple relationships, the absence of any history of STIs and, for men only, the neighborhood proportion of immigrants.</p><p>Our sample was limited to the Paris metropolitan area, which limits its external validity, particularly in nonurban contexts. However, since this region bears the largest part of the HIV burden in mainland France, our conclusions could be useful in helping manage the epidemic [<xref ref-type="bibr" rid="CR26">26</xref>]. Unfortunately, because of the sampling design, we were unable to reach the most vulnerable populations, such as homeless people (among whom immigrants are overrepresented) [<xref ref-type="bibr" rid="CR27">27</xref>]. Also, we interviewed only French-speaking individuals, thereby excluding still more foreigners but non-French-speaking individuals accounted for 5 % of the initial sample. If they had been included in the SIRS cohort, the difference between French persons and foreigners may have been accentuated by the inclusion of more individuals not reached by prevention messages.</p><p>The participants were interviewed retrospectively about any previous HIV testing. The last test had been performed on average about 5 years before the survey date. Thus, there was a possible recall bias concerning the circumstances of the last test. In addition, some respondents may have confused certain routine laboratory tests with the HIV screening test, which would have led to an overestimation of HIV testing, especially among recent immigrants and less educated and/or less health-literate individuals.</p><p>Many studies on the utilization of health-care services have shown that people with a low SES are less likely to avail themselves of preventive care, even in countries where national health services and/or universal health insurance should preclude any financial obstacles to such care [<xref ref-type="bibr" rid="CR28">28</xref>]. For instance, we reported similar socioeconomic gradients in women’s cancer screening in the same survey population [<xref ref-type="bibr" rid="CR29">29</xref>, <xref ref-type="bibr" rid="CR30">30</xref>].</p><p>Taking into account certain indicators of sexual behaviors and attitudes toward PLWHA enabled us to explore the contribution of these factors to some but not all of the observed socioeconomic and demographic differences. In particular, due to a lack of statistical power, we were unable to find a significant association with (self-reported) sexual orientation, since the number of participants who indicated that they were bi- or homosexual was too small in both genders (58 men and 16 women). Moreover, these numbers were probably underestimated, particularly in certain immigrant populations where sexuality and especially homosexuality are still taboo and/or punished by law in their country of origin [<xref ref-type="bibr" rid="CR31">31</xref>].</p><p>The fact that younger people of both sexes were less likely to have been tested for HIV is particularly worrisome. Of course, HIV prevalence in young heterosexual people remains low, with the result that they are not the most at risk for HIV exposure (until now). However, a recent KABP study in the French capital region found that people in this age group had a poorer knowledge and a weaker perception of HIV risk compared not only to the other age groups in 2010, but also to the same age group interviewed previously, between 1992 and 2004 [<xref ref-type="bibr" rid="CR26">26</xref>]. Indeed, in our study, 70.5 % of the men and 34.2 % of the women in this age group reported that they had had more than one sexual partner during the previous 5 years (compared to 24.9 % and 14.5 %, respectively, of the rest of the population), while in a regional KABP study, only 39 % of the men and 27 % of the women in this age group indicated that they had used a condom at last intercourse (compared to 45 % and 36 % in 2004, respectively) [<xref ref-type="bibr" rid="CR26">26</xref>]. We also observed, in a previous analysis, that of the 655 HIV-negative individuals aged 18 to 29 years who had answered the question about their intention regarding protection in 2010, 376 (57.4 %) reported that they consistently used condoms to protect themselves from HIV (men more often than women: 71.0 % vs. 43.3 %, respectively, <italic>p</italic> < 0.001) [<xref ref-type="bibr" rid="CR32">32</xref>].</p><p>We also observed that older age was independently associated with never-testing for HIV in both genders. The recent ANRS-Vespa2 study found that older people were also at higher risk for late presentation of HIV in all the subpopulations that were specifically examined, e.g., heterosexual male and female immigrants born in sub-Saharan Africa or North Africa and North Africans who practice a religion. Moreover, MSM over 50 who did not define themselves as gay were at higher risk for late HIV diagnosis [<xref ref-type="bibr" rid="CR33">33</xref>]. Such a lower level of HIV testing in older individuals could certainly have major consequences on the epidemiology of HIV infection.</p><p>In a previous analysis of the same cohort in 2005 (with far fewer individual characteristics obtained by interview and analyzed), we found that gender, socioeconomic status, immigration status and neighborhood of residence were barriers to HIV testing in the adult population in the Paris metropolitan area [<xref ref-type="bibr" rid="CR17">17</xref>]. We also found that measures aimed at increasing HIV testing in sub-Saharan immigrants may have been effective, given that people from sub-Saharan Africa were more likely to have been tested in their lifetime (78.5 %) than those of French (56.2 %) or Maghreb (39.7 %) origin (<italic>p</italic> < 0.0001) [<xref ref-type="bibr" rid="CR34">34</xref>]. In 2010, we found that women with a sense of belonging to a community and, to a lesser extent, foreign women were less likely to have been HIV-tested than other women. Actually, these two characteristics are obviously correlated, given that a sense of belonging to a community is shared by 49 % of foreign women and 45 % of French women born to at least one foreign parent (compared to 22 % of French women born to French parents, <italic>p</italic> < 0.0001). In men, these figures were, respectively, 49 %, 45 % and 22 % (<italic>p</italic> < 0.0001).</p><p>In our study, we found that individuals with a low lifetime number of couple relationships were less likely to have been tested. Another French study among late-tested HIV-positive individuals found that both male and female heterosexuals in a steady relationship and with children felt that they were less at risk for HIV infection and that this put them at greater risk for never having been tested in the absence of symptoms [<xref ref-type="bibr" rid="CR35">35</xref>]. Generally speaking, since they are not priority targets for testing promotion, individuals at low risk for HIV infection are at high risk for not being tested for HIV and for late diagnosis [<xref ref-type="bibr" rid="CR36">36</xref>]. In our study, a low self-perceived risk for HIV infection was associated with no HIV testing in both sexes. Some studies have reported similar observations in immigrants in Portugal [<xref ref-type="bibr" rid="CR6">6</xref>] and Spain [<xref ref-type="bibr" rid="CR7">7</xref>], and in pregnant women in other European countries [<xref ref-type="bibr" rid="CR2">2</xref>, <xref ref-type="bibr" rid="CR37">37</xref>, <xref ref-type="bibr" rid="CR38">38</xref>]. Deblonde et al., in a systematic review in Europe, found that the main barrier to HIV testing are a low risk perception, fear of HIV disease and of HIV diagnosis disclosure, and lack of access to health services. In our study. the two responses (fear of disease and fear of disclosure) were given, respectively, by only 3 % and 2 % of the never-testers. A minor gradient was observed for fear of disclosure according to immigration status in both sexes (respectively, 0 %, 0.5 % and 8.4 % in the women and 1 %, 1.8 % and 2.7 % in the men).</p><p>The men with a high stigma score towards PLWHA and those who did not know any PLWHA among family, friends or coworkers were more likely to be never-testers. As suggested by Burkholder et al. [<xref ref-type="bibr" rid="CR39">39</xref>], since they do not empathize or identify with PLWHA, people who stigmatize them cannot perceive themselves as possibly being concerned by this matter or at risk for HIV infection. In other words, people with stigmatizing attitudes may perceive a greater distance between themselves and those with the disease [<xref ref-type="bibr" rid="CR31">31</xref>]. Stigma serves to emphasize and enhance the differences between the stigmatizers and those being stigmatized [<xref ref-type="bibr" rid="CR40">40</xref>].</p><p>The association observed between no HIV testing and no history of STIs could be due to the fact that French health authorities recommend proposing an HIV test whenever an STI is suspected [<xref ref-type="bibr" rid="CR41">41</xref>]. Practically, this recommendation seems to be followed by some health professionals but not a majority of them. Indeed, in a French study in newly diagnosed HIV-infected people carried out in 2010, only half of the individuals with STIs during the 3 years prior to HIV diagnosis had actually received an HIV testing proposal from a health-care provider [<xref ref-type="bibr" rid="CR42">42</xref>] .</p><p>Lastly, our study found a contextual effect on no lifetime HIV testing in men. Indeed, the decrease in the level 2 variance and its <italic>p</italic>-values showed that introducing the proportion of immigrants living in the neighborhood of residence explained part of the observed differences between neighborhoods. In contrast, in women, the significant differences in the observed crude prevalence rates of HIV testing between neighborhoods were mainly explained by a composition effect (i.e., by individual characteristics).</p><p>The men living in neighborhoods with a high proportion of immigrants (more than 28 %) were two times less likely to have been HIV-tested those living in neighborhoods with a proportion of immigrants between 17 and 23 %. This could be explained by a number of norms shared by immigrant men in these neighborhoods, such as the fear of stigmatization or discrimination related to being tested for HIV (regardless of the result). Indeed, we observed that foreigners and French persons born to at least one foreign parent were more likely to have a positive stigma score than French persons born to French parents (61.0 %, 48.2 % and 34.3 %, respectively, in men, <italic>p</italic> < 0.0001; 60.2 %, 48.4 % and 31.3 %, respectively, in women, <italic>p</italic> < 0.0001). Similarly, foreigners and French persons born to at least one foreign parent were less likely to report that they knew a PLWHA than French persons born to French parents, (19.2 %, 28.8 % and 39.0 %, respectively, in men, <italic>p</italic> < 0.0001; 28.7 %, 27.6 % and 42.2 %, respectively, in women, <italic>p</italic> < 0.0001). Lastly, not knowing any PLWHA was significantly associated with a positive stigma score: 47.6 % of the men who did not know any PLWHA had a positive stigma score versus 28.1 % of those who did (<italic>p</italic> <0.001). In the women, these figures were, respectively, 47.9 % and 23.6 % (<italic>p</italic> <0.001).</p><p>No lifetime HIV testing could also be a consequence of differentiated practices by health professionals according to their patients’ social or demographic characteristics. For instance, in 2003, a French study found that the factors associated with the lack of proposing HIV/AIDS and hepatitis B and C screening in general practice to underprivileged immigrants were gender (women were screened less for HBV and HCV infection) and being from a non-sub-Saharan African country (especially from North Africa) for all three viruses [<xref ref-type="bibr" rid="CR43">43</xref>].</p></sec><sec id="Sec19" sec-type="conclusion"><title>Conclusions</title><p>At a time when, in France, many people remain unaware of their HIV status, when the proportion of people screened late is not decreasing and when many practitioners are not adhering to the recommendations for universal screening in primary care [<xref ref-type="bibr" rid="CR44">44</xref>], it seems more important than ever that HIV screening services target not only the high-risk populations, but also those with a lower self-perceived risk of infection and/or at high risk for stigma, such as younger and older people, those in a steady relationship, and men living in immigrant neighborhoods. In 2016, a new French policy will merge (previously split) HIV, viral hepatitis and/or STI screening centers into comprehensive sexual health centers, which will provide all these screening tests, as well as information, contraception, STI care and linkage to specialist care. This will possibly increase access to HIV screening for those who stay away from HIV testing services. Also, community-based and/or outreach, combined, rapid screening test services should not be limited in France to MSM communities but rather extended to other communities, in particular, immigrant communities other than just that from sub-Saharan Africa.</p></sec></body><back><fn-group><fn><p><bold>Competing interests</bold></p><p>The authors have declared that no financial competing interests exist.</p></fn><fn><p><bold>Authors’ contributions</bold></p><p>All the authors contributed to the study. VM, AL, PC and DC had the idea for the study. All the authors substantially contributed to the conception and design of the study. VM, PC, AL and RDS created the questionnaire used in the study. AL and MCG were responsible for the data management. VM and MCG performed the statistical analyses and presented the results. All the authors participated in the interpretation of the results. VM, PC and RDS drafted the article. All the authors critically reviewed the manuscript for important intellectual content and approved the final version.”</p></fn></fn-group><ack><title>Funding</title><p>The SIRS survey was supported by the Institute for Public Health Research (IReSP) (grant number 2008-87; URL:<ext-link ext-link-type="uri" xlink:href="http://www.iresp.net/">http://www.iresp.net</ext-link>), the French National Agency for Research on AIDS and Viral Hepatitis (ANRS) (grant number 2009-072), and Sidaction.</p><p>The funders had no role in the study design, data collection and analysis, decision to publish, or preparation of the manuscript.</p></ack><ref-list id="Bib1"><title>References</title><ref id="CR1"><label>1.</label><element-citation publication-type="journal"><person-group person-group-type="author"><name><surname>De Wit</surname><given-names>JB</given-names></name><name><surname>Adam</surname><given-names>PC</given-names></name></person-group><article-title>To or not to test: psychosocial barriers 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