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
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<front><div type="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.</div>
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<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>
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<title-group><article-title>Measuring trends in age at first sex and age at marriage in Manicaland, Zimbabwe</article-title>
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<contrib-group><contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Cremin</surname>
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<contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Mushati</surname>
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<aff id="aff1"><label>1</label>
<addr-line>Department of Infectious Disease Epidemiology, Imperial College London, UK</addr-line>
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<addr-line>Biomedical Research and Training Institute, Harare, Zimbabwe</addr-line>
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<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>
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<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>
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<pub-date pub-type="collection"><year>2009</year>
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<year>2009</year>
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<pub-date pub-type="epub"><day>23</day>
<month>3</month>
<year>2009</year>
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<volume>85</volume>
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<issue>Suppl 1</issue>
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<issue-title>Trends in sexual behaviour and marriage in sub-Saharan Africa</issue-title>
<fpage>i34</fpage>
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<month>12</month>
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<permissions><copyright-statement>© Cremin et al 2009</copyright-statement>
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<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>
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