Measuring trends in age at first sex and age at marriage in Manicaland, Zimbabwe
Identifieur interne : 000C73 ( Istex/Corpus ); précédent : 000C72; suivant : 000C74Measuring trends in age at first sex and age at marriage in Manicaland, Zimbabwe
Auteurs : I. Cremin ; P. Mushati ; T. Hallett ; Z. Mupambireyi ; C. Nyamukapa ; G P Garnett ; S. GregsonSource :
- Sexually Transmitted Infections [ 1368-4973 ] ; 2009-04.
English descriptors
- KwdEn :
- Analyse data, Average number, Behavior change, Behaviour, Birth cohort, Birth cohort women, Birth cohorts, Cohort, Early marriage, Eastern zimbabwe, Failure curve, Failure curves, First marriage, First round, Health survey, High levels, Imperial college london, Inconsistent reports, Infectious disease epidemiology, Interquartile range, Late marriage, Life table format, Manicaland, Manicaland prevention project, Manicaland province, Median, Median ages, Median estimates, Multiple surveys, Office harare, Older birth cohorts, Overall trends, Proximate determinants, Random misreporting, Rural zimbabwe, Sexual behaviour, Sexual debut, Sexual risk behaviour, Similar levels, Small sample sizes, Social desirability bias, Study population, Subsequent risk, Supplement figure, Supplement table, Survey reports, Third surveys, Transm, Uganda, Unreliable, Unreliable reports, Upper value, Urban uganda, Women test, Younger ages, Younger birth cohorts, Zimbabwe.
- Teeft :
- Analyse data, Average number, Behavior change, Behaviour, Birth cohort, Birth cohort women, Birth cohorts, Cohort, Early marriage, Eastern zimbabwe, Failure curve, Failure curves, First marriage, First round, Health survey, High levels, Imperial college london, Inconsistent reports, Infectious disease epidemiology, Interquartile range, Late marriage, Life table format, Manicaland, Manicaland prevention project, Manicaland province, Median, Median ages, Median estimates, Multiple surveys, Office harare, Older birth cohorts, Overall trends, Proximate determinants, Random misreporting, Rural zimbabwe, Sexual behaviour, Sexual debut, Sexual risk behaviour, Similar levels, Small sample sizes, Social desirability bias, Study population, Subsequent risk, Supplement figure, Supplement table, Survey reports, Third surveys, Transm, Uganda, Unreliable, Unreliable reports, Upper value, Urban uganda, Women test, Younger ages, Younger birth cohorts, Zimbabwe.
Abstract
Objective: To identify reporting biases and to determine the influence of inconsistent reporting on observed trends in the timing of age at first sex and age at marriage. Methods: Longitudinal data from three rounds of a population-based cohort in eastern Zimbabwe were analysed. Reports of age at first sex and age at marriage from 6837 individuals attending multiple rounds were classified according to consistency. Survival analysis was used to identify trends in the timing of first sex and marriage. Results: In this population, women initiate sex and enter marriage at younger ages than men but spend much less time between first sex and marriage. Among those surveyed between 1998 and 2005, median ages at first sex and first marriage were 18.5 years and 21.4 years for men and 18.2 years and 18.5 years, respectively, for women aged 15–54 years. High levels of reports of both age at first sex and age at marriage among those attending multiple surveys were found to be unreliable. Excluding reports identified as unreliable from these analyses did not alter the observed trends in either age at first sex or age at marriage. Tracing birth cohorts as they aged revealed reporting biases, particularly among the youngest cohorts. Comparisons by birth cohorts, which span a period of >40 years, indicate that median age at first sex has remained constant over time for women but has declined gradually for men. Conclusions: Although many reports of age at first sex and age at marriage were found to be unreliable, inclusion of such reports did not result in artificial generation or suppression of trends.
Url:
DOI: 10.1136/sti.2008.033431
Links to Exploration step
ISTEX:27ED1BE6016F4CAD5904642625834886CFD2CB5DLe document en format XML
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Hallett</name><affiliation><mods:affiliation>Department of Infectious Disease Epidemiology, Imperial College London, UK</mods:affiliation></affiliation></author><author><name sortKey="Mupambireyi, Z" sort="Mupambireyi, Z" uniqKey="Mupambireyi Z" first="Z" last="Mupambireyi">Z. Mupambireyi</name><affiliation><mods:affiliation>Biomedical Research and Training Institute, Harare, Zimbabwe</mods:affiliation></affiliation></author><author><name sortKey="Nyamukapa, C" sort="Nyamukapa, C" uniqKey="Nyamukapa C" first="C" last="Nyamukapa">C. 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Methods: Longitudinal data from three rounds of a population-based cohort in eastern Zimbabwe were analysed. Reports of age at first sex and age at marriage from 6837 individuals attending multiple rounds were classified according to consistency. Survival analysis was used to identify trends in the timing of first sex and marriage. Results: In this population, women initiate sex and enter marriage at younger ages than men but spend much less time between first sex and marriage. Among those surveyed between 1998 and 2005, median ages at first sex and first marriage were 18.5 years and 21.4 years for men and 18.2 years and 18.5 years, respectively, for women aged 15–54 years. High levels of reports of both age at first sex and age at marriage among those attending multiple surveys were found to be unreliable. Excluding reports identified as unreliable from these analyses did not alter the observed trends in either age at first sex or age at marriage. Tracing birth cohorts as they aged revealed reporting biases, particularly among the youngest cohorts. Comparisons by birth cohorts, which span a period of >40 years, indicate that median age at first sex has remained constant over time for women but has declined gradually for men. Conclusions: Although many reports of age at first sex and age at marriage were found to be unreliable, inclusion of such reports did not result in artificial generation or suppression of trends.</div></front></TEI><istex><corpusName>bmj</corpusName><keywords><teeft><json:string>cohort</json:string><json:string>zimbabwe</json:string><json:string>median</json:string><json:string>transm</json:string><json:string>birth cohort</json:string><json:string>birth cohorts</json:string><json:string>unreliable reports</json:string><json:string>uganda</json:string><json:string>sexual behaviour</json:string><json:string>manicaland</json:string><json:string>inconsistent reports</json:string><json:string>sexual debut</json:string><json:string>office harare</json:string><json:string>health survey</json:string><json:string>eastern zimbabwe</json:string><json:string>first marriage</json:string><json:string>high levels</json:string><json:string>interquartile range</json:string><json:string>early marriage</json:string><json:string>social desirability bias</json:string><json:string>imperial college london</json:string><json:string>failure curves</json:string><json:string>unreliable</json:string><json:string>behaviour</json:string><json:string>random misreporting</json:string><json:string>overall trends</json:string><json:string>late marriage</json:string><json:string>first round</json:string><json:string>proximate determinants</json:string><json:string>analyse data</json:string><json:string>survey reports</json:string><json:string>supplement table</json:string><json:string>manicaland province</json:string><json:string>multiple surveys</json:string><json:string>third surveys</json:string><json:string>failure curve</json:string><json:string>median ages</json:string><json:string>younger ages</json:string><json:string>similar levels</json:string><json:string>manicaland prevention project</json:string><json:string>life table format</json:string><json:string>older birth cohorts</json:string><json:string>younger birth cohorts</json:string><json:string>supplement figure</json:string><json:string>median estimates</json:string><json:string>upper value</json:string><json:string>birth cohort women</json:string><json:string>small sample sizes</json:string><json:string>average number</json:string><json:string>study population</json:string><json:string>subsequent risk</json:string><json:string>rural zimbabwe</json:string><json:string>behavior change</json:string><json:string>urban uganda</json:string><json:string>sexual risk behaviour</json:string><json:string>infectious disease epidemiology</json:string><json:string>women test</json:string></teeft></keywords><author><json:item><name>I Cremin</name><affiliations><json:string>Department of Infectious Disease Epidemiology, Imperial College London, UK</json:string></affiliations></json:item><json:item><name>P Mushati</name><affiliations><json:string>Biomedical Research and Training Institute, Harare, Zimbabwe</json:string></affiliations></json:item><json:item><name>T Hallett</name><affiliations><json:string>Department of Infectious Disease Epidemiology, Imperial College London, UK</json:string></affiliations></json:item><json:item><name>Z Mupambireyi</name><affiliations><json:string>Biomedical Research and Training Institute, Harare, Zimbabwe</json:string></affiliations></json:item><json:item><name>C Nyamukapa</name><affiliations><json:string>Biomedical Research and Training Institute, Harare, Zimbabwe</json:string></affiliations></json:item><json:item><name>G P Garnett</name><affiliations><json:string>Department of Infectious Disease Epidemiology, Imperial College London, UK</json:string></affiliations></json:item><json:item><name>S Gregson</name><affiliations><json:string>Department of Infectious Disease Epidemiology, Imperial College London, UK</json:string><json:string>Biomedical Research and Training Institute, Harare, Zimbabwe</json:string></affiliations></json:item></author><articleId><json:string>st33431</json:string></articleId><language><json:string>eng</json:string></language><originalGenre><json:string>research-article</json:string></originalGenre><abstract>Objective: To identify reporting biases and to determine the influence of inconsistent reporting on observed trends in the timing of age at first sex and age at marriage. Methods: Longitudinal data from three rounds of a population-based cohort in eastern Zimbabwe were analysed. Reports of age at first sex and age at marriage from 6837 individuals attending multiple rounds were classified according to consistency. Survival analysis was used to identify trends in the timing of first sex and marriage. Results: In this population, women initiate sex and enter marriage at younger ages than men but spend much less time between first sex and marriage. Among those surveyed between 1998 and 2005, median ages at first sex and first marriage were 18.5 years and 21.4 years for men and 18.2 years and 18.5 years, respectively, for women aged 15–54 years. High levels of reports of both age at first sex and age at marriage among those attending multiple surveys were found to be unreliable. Excluding reports identified as unreliable from these analyses did not alter the observed trends in either age at first sex or age at marriage. Tracing birth cohorts as they aged revealed reporting biases, particularly among the youngest cohorts. Comparisons by birth cohorts, which span a period of >40 years, indicate that median age at first sex has remained constant over time for women but has declined gradually for men. Conclusions: Although many reports of age at first sex and age at marriage were found to be unreliable, inclusion of such reports did not result in artificial generation or suppression of trends.</abstract><qualityIndicators><score>7.433</score><pdfVersion>1.2</pdfVersion><pdfPageSize>595.276 x 793.701 pts</pdfPageSize><refBibsNative>false</refBibsNative><keywordCount>0</keywordCount><abstractCharCount>1612</abstractCharCount><pdfWordCount>4433</pdfWordCount><pdfCharCount>27923</pdfCharCount><pdfPageCount>7</pdfPageCount><abstractWordCount>264</abstractWordCount></qualityIndicators><title>Measuring trends in age at first sex and age at marriage in Manicaland, Zimbabwe</title><pmid><json:string>19307339</json:string></pmid><genre><json:string>research-article</json:string></genre><host><title>Sexually Transmitted Infections</title><language><json:string>unknown</json:string></language><issn><json:string>1368-4973</json:string></issn><eissn><json:string>1472-3263</json:string></eissn><publisherId><json:string>sti</json:string></publisherId><volume>85</volume><issue>Suppl 1</issue><pages><first>i34</first></pages><genre><json:string>journal</json:string></genre></host><categories><inist><json:string>sciences appliquees, technologies et medecines</json:string><json:string>sciences biologiques et medicales</json:string><json:string>sciences medicales</json:string></inist></categories><publicationDate>2009</publicationDate><copyrightDate>2009</copyrightDate><doi><json:string>10.1136/sti.2008.033431</json:string></doi><id>27ED1BE6016F4CAD5904642625834886CFD2CB5D</id><score>1</score><fulltext><json:item><extension>pdf</extension><original>true</original><mimetype>application/pdf</mimetype><uri>https://api.istex.fr/document/27ED1BE6016F4CAD5904642625834886CFD2CB5D/fulltext/pdf</uri></json:item><json:item><extension>zip</extension><original>false</original><mimetype>application/zip</mimetype><uri>https://api.istex.fr/document/27ED1BE6016F4CAD5904642625834886CFD2CB5D/fulltext/zip</uri></json:item><istex:fulltextTEI uri="https://api.istex.fr/document/27ED1BE6016F4CAD5904642625834886CFD2CB5D/fulltext/tei"><teiHeader><fileDesc><titleStmt><title level="a" type="main" xml:lang="en">Measuring trends in age at first sex and age at marriage in Manicaland, Zimbabwe</title></titleStmt><publicationStmt><authority>ISTEX</authority><publisher scheme="https://publisher-list.data.istex.fr">BMJ Publishing Group Ltd</publisher><availability status="free"><p>Open Access</p></availability><date>2009-03-23</date></publicationStmt><notesStmt><note type="research-article" scheme="https://content-type.data.istex.fr/ark:/67375/XTP-1JC4F85T-7">research-article</note><note type="journal" scheme="https://publication-type.data.istex.fr/ark:/67375/JMC-0GLKJH51-B">journal</note><note>Contributors: SG and GPG designed the research, PM, ZM and CN performed the research, IC and TH analysed the data. All authors contributed to preparing the manuscript.</note></notesStmt><sourceDesc><biblStruct type="inbook"><analytic><title level="a" type="main" xml:lang="en">Measuring trends in age at first sex and age at marriage in Manicaland, Zimbabwe</title><author xml:id="author-0000"><persName><forename type="first">I</forename><surname>Cremin</surname></persName><affiliation>Department of Infectious Disease Epidemiology, Imperial College London, UK</affiliation></author><author xml:id="author-0001"><persName><forename type="first">P</forename><surname>Mushati</surname></persName><affiliation>Biomedical Research and Training Institute, Harare, Zimbabwe</affiliation></author><author xml:id="author-0002"><persName><forename type="first">T</forename><surname>Hallett</surname></persName><affiliation>Department of Infectious Disease Epidemiology, Imperial College London, UK</affiliation></author><author xml:id="author-0003"><persName><forename type="first">Z</forename><surname>Mupambireyi</surname></persName><affiliation>Biomedical Research and Training Institute, Harare, Zimbabwe</affiliation></author><author xml:id="author-0004"><persName><forename type="first">C</forename><surname>Nyamukapa</surname></persName><affiliation>Biomedical Research and Training Institute, Harare, Zimbabwe</affiliation></author><author xml:id="author-0005"><persName><forename type="first">G P</forename><surname>Garnett</surname></persName><affiliation>Department of Infectious Disease Epidemiology, Imperial College London, UK</affiliation></author><author xml:id="author-0006"><persName><forename type="first">S</forename><surname>Gregson</surname></persName><affiliation>Department of Infectious Disease Epidemiology, Imperial College London, UK</affiliation><affiliation>Biomedical Research and Training Institute, Harare, Zimbabwe</affiliation></author><idno type="istex">27ED1BE6016F4CAD5904642625834886CFD2CB5D</idno><idno type="ark">ark:/67375/NVC-K97C67SX-L</idno><idno type="DOI">10.1136/sti.2008.033431</idno><idno type="href">sextrans-85-i34.pdf</idno><idno type="article-id">st33431</idno><idno type="PMID">19307339</idno><idno type="local">sextrans;85/Suppl_1/i34</idno></analytic><monogr><title level="j">Sexually Transmitted Infections</title><title level="j" type="abbrev">Sex Transm Infect</title><idno type="pISSN">1368-4973</idno><idno type="eISSN">1472-3263</idno><idno type="publisher-id">sti</idno><idno type="PublisherID-hwp">sextrans</idno><idno type="PublisherID-nlm-ta">Sex Transm Infect</idno><imprint><publisher>BMJ Publishing Group Ltd</publisher><date type="published" when="2009-04"></date><biblScope unit="volume">85</biblScope><biblScope unit="issue">Suppl 1</biblScope><biblScope unit="page" from="34">i34</biblScope></imprint></monogr></biblStruct></sourceDesc></fileDesc><profileDesc><creation><date>2009-03-23</date></creation><langUsage><language ident="en">en</language></langUsage><abstract><p>Objective: To identify reporting biases and to determine the influence of inconsistent reporting on observed trends in the timing of age at first sex and age at marriage. Methods: Longitudinal data from three rounds of a population-based cohort in eastern Zimbabwe were analysed. Reports of age at first sex and age at marriage from 6837 individuals attending multiple rounds were classified according to consistency. Survival analysis was used to identify trends in the timing of first sex and marriage. Results: In this population, women initiate sex and enter marriage at younger ages than men but spend much less time between first sex and marriage. Among those surveyed between 1998 and 2005, median ages at first sex and first marriage were 18.5 years and 21.4 years for men and 18.2 years and 18.5 years, respectively, for women aged 15–54 years. High levels of reports of both age at first sex and age at marriage among those attending multiple surveys were found to be unreliable. Excluding reports identified as unreliable from these analyses did not alter the observed trends in either age at first sex or age at marriage. Tracing birth cohorts as they aged revealed reporting biases, particularly among the youngest cohorts. Comparisons by birth cohorts, which span a period of >40 years, indicate that median age at first sex has remained constant over time for women but has declined gradually for men. Conclusions: Although many reports of age at first sex and age at marriage were found to be unreliable, inclusion of such reports did not result in artificial generation or suppression of trends.</p></abstract></profileDesc><revisionDesc><change when="2009-03-23">Created</change><change when="2009-04">Published</change></revisionDesc></teiHeader></istex:fulltextTEI><json:item><extension>txt</extension><original>false</original><mimetype>text/plain</mimetype><uri>https://api.istex.fr/document/27ED1BE6016F4CAD5904642625834886CFD2CB5D/fulltext/txt</uri></json:item></fulltext><metadata><istex:metadataXml wicri:clean="corpus bmj" wicri:toSee="no header"><istex:xmlDeclaration>version="1.0" encoding="UTF-8" standalone="no"</istex:xmlDeclaration><istex:docType PUBLIC="-//NLM//DTD Journal Archiving and Interchange DTD v2.3 20070202//EN" URI="archivearticle.dtd" name="istex:docType"></istex:docType><istex:document><article article-type="research-article" xml:lang="EN"><front><journal-meta><journal-id journal-id-type="hwp">sextrans</journal-id><journal-id journal-id-type="nlm-ta">Sex Transm Infect</journal-id><journal-id journal-id-type="publisher-id">sti</journal-id><journal-title>Sexually Transmitted Infections</journal-title><abbrev-journal-title abbrev-type="publisher">Sex Transm Infect</abbrev-journal-title><issn pub-type="ppub">1368-4973</issn><issn pub-type="epub">1472-3263</issn><publisher><publisher-name>BMJ Publishing Group Ltd</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">st33431</article-id><article-id pub-id-type="doi">10.1136/sti.2008.033431</article-id><article-id pub-id-type="other">sextrans;85/Suppl_1/i34</article-id><article-id pub-id-type="pmid">19307339</article-id><article-id pub-id-type="other">i34</article-id><article-id pub-id-type="other">sti.2008.033431</article-id><article-categories><subj-group subj-group-type="heading"><subject>Supplement</subject></subj-group></article-categories><title-group><article-title>Measuring trends in age at first sex and age at marriage in Manicaland, Zimbabwe</article-title><alt-title alt-title-type="running-head">Supplement</alt-title></title-group><contrib-group><contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Cremin</surname><given-names>I</given-names></name><xref ref-type="aff" rid="aff1">1</xref></contrib><contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Mushati</surname><given-names>P</given-names></name><xref ref-type="aff" rid="aff2">2</xref></contrib><contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Hallett</surname><given-names>T</given-names></name><xref ref-type="aff" rid="aff1">1</xref></contrib><contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Mupambireyi</surname><given-names>Z</given-names></name><xref ref-type="aff" rid="aff2">2</xref></contrib><contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Nyamukapa</surname><given-names>C</given-names></name><xref ref-type="aff" rid="aff2">2</xref></contrib><contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Garnett</surname><given-names>G P</given-names></name><xref ref-type="aff" rid="aff1">1</xref></contrib><contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Gregson</surname><given-names>S</given-names></name><xref ref-type="aff" rid="aff1">1</xref><xref ref-type="aff" rid="aff2">2</xref></contrib></contrib-group><aff id="aff1"><label>1</label><addr-line>Department of Infectious Disease Epidemiology, Imperial College London, UK</addr-line> </aff><aff id="aff2"><label>2</label><addr-line>Biomedical Research and Training Institute, Harare, Zimbabwe</addr-line> </aff><author-notes><corresp>Ms I Cremin, Department of Infectious Disease Epidemiology, Imperial College London, St Mary’s Campus, Norfolk Place, London W2 1PG, UK; <email xlink:type="simple">ide.cremin05@imperial.ac.uk</email></corresp><fn fn-type="other"><p><bold>Contributors:</bold> SG and GPG designed the research, PM, ZM and CN performed the research, IC and TH analysed the data. All authors contributed to preparing the manuscript.</p></fn></author-notes><pub-date pub-type="collection"><year>2009</year></pub-date><pub-date pub-type="ppub"><month>4</month><year>2009</year></pub-date><pub-date pub-type="epub"><day>23</day><month>3</month><year>2009</year></pub-date><volume>85</volume><volume-id pub-id-type="other">85</volume-id><volume-id pub-id-type="other">85</volume-id><issue>Suppl 1</issue><issue-id pub-id-type="other">sextrans;85/Suppl_1</issue-id><issue-id pub-id-type="other" content-type="supplement">Suppl_1</issue-id><issue-id pub-id-type="other">85/Suppl_1</issue-id><issue-title>Trends in sexual behaviour and marriage in sub-Saharan Africa</issue-title><fpage>i34</fpage><history><date date-type="accepted"><day>19</day><month>12</month><year>2008</year></date></history><permissions><copyright-statement>© Cremin et al 2009</copyright-statement><copyright-year>2009</copyright-year><license license-type="open-access" xlink:href="http://creativecommons.org/licenses/by/2.0/" xlink:type="simple"><p>This is an open-access article distributed under the terms of the Creative Commons Attribution Non-commercial License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.</p></license></permissions><self-uri content-type="pdf" xlink:role="full-text" xlink:href="sextrans-85-i34.pdf"></self-uri><abstract><sec><title>Objective:</title><p>To identify reporting biases and to determine the influence of inconsistent reporting on observed trends in the timing of age at first sex and age at marriage.</p></sec><sec><title>Methods:</title><p>Longitudinal data from three rounds of a population-based cohort in eastern Zimbabwe were analysed. Reports of age at first sex and age at marriage from 6837 individuals attending multiple rounds were classified according to consistency. Survival analysis was used to identify trends in the timing of first sex and marriage.</p></sec><sec><title>Results:</title><p>In this population, women initiate sex and enter marriage at younger ages than men but spend much less time between first sex and marriage. Among those surveyed between 1998 and 2005, median ages at first sex and first marriage were 18.5 years and 21.4 years for men and 18.2 years and 18.5 years, respectively, for women aged 15–54 years. High levels of reports of both age at first sex and age at marriage among those attending multiple surveys were found to be unreliable. Excluding reports identified as unreliable from these analyses did not alter the observed trends in either age at first sex or age at marriage. Tracing birth cohorts as they aged revealed reporting biases, particularly among the youngest cohorts. Comparisons by birth cohorts, which span a period of >40 years, indicate that median age at first sex has remained constant over time for women but has declined gradually for men.</p></sec><sec><title>Conclusions:</title><p>Although many reports of age at first sex and age at marriage were found to be unreliable, inclusion of such reports did not result in artificial generation or suppression of trends.</p></sec></abstract></article-meta></front></article></istex:document></istex:metadataXml><mods version="3.6"><titleInfo lang="en"><title>Measuring trends in age at first sex and age at marriage in Manicaland, Zimbabwe</title></titleInfo><titleInfo type="alternative" lang="en" contentType="CDATA"><title>Measuring trends in age at first sex and age at marriage in Manicaland, Zimbabwe</title></titleInfo><name type="personal"><namePart type="given">I</namePart><namePart type="family">Cremin</namePart><affiliation>Department of Infectious Disease Epidemiology, Imperial College London, UK</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">P</namePart><namePart type="family">Mushati</namePart><affiliation>Biomedical Research and Training Institute, Harare, Zimbabwe</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">T</namePart><namePart type="family">Hallett</namePart><affiliation>Department of Infectious Disease Epidemiology, Imperial College London, UK</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">Z</namePart><namePart type="family">Mupambireyi</namePart><affiliation>Biomedical Research and Training Institute, Harare, Zimbabwe</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">C</namePart><namePart type="family">Nyamukapa</namePart><affiliation>Biomedical Research and Training Institute, Harare, Zimbabwe</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">G P</namePart><namePart type="family">Garnett</namePart><affiliation>Department of Infectious Disease Epidemiology, Imperial College London, UK</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">S</namePart><namePart type="family">Gregson</namePart><affiliation>Department of Infectious Disease Epidemiology, Imperial College London, UK</affiliation><affiliation>Biomedical Research and Training Institute, Harare, Zimbabwe</affiliation><role><roleTerm type="text">author</roleTerm></role></name><typeOfResource>text</typeOfResource><genre type="research-article" displayLabel="research-article" authority="ISTEX" authorityURI="https://content-type.data.istex.fr" valueURI="https://content-type.data.istex.fr/ark:/67375/XTP-1JC4F85T-7">research-article</genre><originInfo><publisher>BMJ Publishing Group Ltd</publisher><dateIssued encoding="w3cdtf">2009-04</dateIssued><dateCreated encoding="w3cdtf">2009-03-23</dateCreated><copyrightDate encoding="w3cdtf">2009</copyrightDate></originInfo><language><languageTerm type="code" authority="iso639-2b">eng</languageTerm><languageTerm type="code" authority="rfc3066">en</languageTerm></language><abstract>Objective: To identify reporting biases and to determine the influence of inconsistent reporting on observed trends in the timing of age at first sex and age at marriage. Methods: Longitudinal data from three rounds of a population-based cohort in eastern Zimbabwe were analysed. Reports of age at first sex and age at marriage from 6837 individuals attending multiple rounds were classified according to consistency. Survival analysis was used to identify trends in the timing of first sex and marriage. Results: In this population, women initiate sex and enter marriage at younger ages than men but spend much less time between first sex and marriage. Among those surveyed between 1998 and 2005, median ages at first sex and first marriage were 18.5 years and 21.4 years for men and 18.2 years and 18.5 years, respectively, for women aged 15–54 years. High levels of reports of both age at first sex and age at marriage among those attending multiple surveys were found to be unreliable. Excluding reports identified as unreliable from these analyses did not alter the observed trends in either age at first sex or age at marriage. Tracing birth cohorts as they aged revealed reporting biases, particularly among the youngest cohorts. Comparisons by birth cohorts, which span a period of >40 years, indicate that median age at first sex has remained constant over time for women but has declined gradually for men. Conclusions: Although many reports of age at first sex and age at marriage were found to be unreliable, inclusion of such reports did not result in artificial generation or suppression of trends.</abstract><note type="footnotes">Contributors: SG and GPG designed the research, PM, ZM and CN performed the research, IC and TH analysed the data. All authors contributed to preparing the manuscript.</note><relatedItem type="host"><titleInfo><title>Sexually Transmitted Infections</title></titleInfo><titleInfo type="abbreviated"><title>Sex Transm Infect</title></titleInfo><genre type="journal" authority="ISTEX" authorityURI="https://publication-type.data.istex.fr" valueURI="https://publication-type.data.istex.fr/ark:/67375/JMC-0GLKJH51-B">journal</genre><identifier type="ISSN">1368-4973</identifier><identifier type="eISSN">1472-3263</identifier><identifier type="PublisherID">sti</identifier><identifier type="PublisherID-hwp">sextrans</identifier><identifier type="PublisherID-nlm-ta">Sex Transm Infect</identifier><part><date>2009</date><detail type="title"><title>Trends in sexual behaviour and marriage in sub-Saharan Africa</title></detail><detail type="volume"><caption>vol.</caption><number>85</number></detail><detail type="issue"><caption>no.</caption><number>Suppl 1</number></detail><extent unit="pages"><start>i34</start></extent></part></relatedItem><identifier type="istex">27ED1BE6016F4CAD5904642625834886CFD2CB5D</identifier><identifier type="ark">ark:/67375/NVC-K97C67SX-L</identifier><identifier type="DOI">10.1136/sti.2008.033431</identifier><identifier type="href">sextrans-85-i34.pdf</identifier><identifier type="ArticleID">st33431</identifier><identifier type="PMID">19307339</identifier><identifier type="local">sextrans;85/Suppl_1/i34</identifier><accessCondition type="use and reproduction" contentType="open-access">This is an open-access article distributed under the terms of the Creative Commons Attribution Non-commercial License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.</accessCondition><recordInfo><recordContentSource authority="ISTEX" authorityURI="https://loaded-corpus.data.istex.fr" valueURI="https://loaded-corpus.data.istex.fr/ark:/67375/XBH-7M42M2QJ-2">bmj</recordContentSource><recordOrigin>© Cremin et al 2009</recordOrigin></recordInfo></mods><json:item><extension>json</extension><original>false</original><mimetype>application/json</mimetype><uri>https://api.istex.fr/document/27ED1BE6016F4CAD5904642625834886CFD2CB5D/metadata/json</uri></json:item></metadata><annexes><json:item><extension>jpeg</extension><original>true</original><mimetype>image/jpeg</mimetype><uri>https://api.istex.fr/document/27ED1BE6016F4CAD5904642625834886CFD2CB5D/annexes/jpeg</uri></json:item></annexes><serie></serie></istex></record>Pour manipuler ce document sous Unix (Dilib)
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