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Trends in age at first sex in Uganda: evidence from Demographic and Health Survey data and longitudinal cohorts in Masaka and Rakai.

Slaymaker E, Bwanika JB, Kasamba I, Lutalo T, Maher D, Todd J - Sex Transm Infect (2009)

Bottom Line: Successive male cohorts in Masaka appeared first to have an increased AFS which subsequently decreased, a trend that was also apparent (but not significant) in the DHS data.For men, AFS has not changed consistently over the period in question.Differences between Masaka and Rakai may reflect socioeconomic differences.

View Article: PubMed Central - PubMed

Affiliation: Centre for Population Studies, London School of Hygiene and Tropical Medicine, London, UK. emma.slaymaker@lshtm.ac.uk

ABSTRACT

Objectives: To derive the best possible estimates of trends in age at first sex (AFS) among successive cohorts of Ugandan men and women based on all the data available from the Demographic and Health Surveys (DHS) and cohort studies in Masaka and Rakai districts.

Methods: The datasets from the DHS, Masaka cohort and Rakai cohort were analysed separately. Survival analysis methods were used to estimate median AFS for men and women born in the 1950s-1980s and to compute hazard ratios for first sex, comparing later cohorts with earlier cohorts.

Results: The DHS and Masaka data showed an increase in AFS in women in the more recent birth cohorts compared with those born before 1970, but this was less apparent in the Rakai data. Successive male cohorts in Masaka appeared first to have an increased AFS which subsequently decreased, a trend that was also apparent (but not significant) in the DHS data. Younger men in Rakai had an earlier AFS than those born before 1980.

Conclusions: Women in Uganda who were born after 1970 have, on average, had sex at a later age than those born earlier. For men, AFS has not changed consistently over the period in question. Differences between Masaka and Rakai may reflect socioeconomic differences. Most of the change in AFS occurred too late to have contributed to the initial decline in the incidence of HIV.

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Survival curves (cumulative proportion who have had sex by age) for men and                        women born since 1970 by 5-year birth cohorts. (A) Pooled Demographic and                        Health Survey data; (B) Masaka study; (C) Rakai study.
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U9G-85-S1-0012-f02: Survival curves (cumulative proportion who have had sex by age) for men and women born since 1970 by 5-year birth cohorts. (A) Pooled Demographic and Health Survey data; (B) Masaka study; (C) Rakai study.

Mentions: In restricting the analysis to those born after 1 January 1970, the survival curves for 5-year birth cohorts are shown in fig 2 and the relative hazards in table 4. In the DHS and Masaka studies, men and women in the later cohorts (those born in 1980–4 and 1985–9) had delayed AFS (fig 2). The Rakai data show the opposite, with the later cohorts having earlier AFS. This pattern is clearly seen in the hazard ratios for AFS in table 4, which shows increased hazard in the later cohorts in Rakai but reduced hazards in the DHS and Masaka studies.


Trends in age at first sex in Uganda: evidence from Demographic and Health Survey data and longitudinal cohorts in Masaka and Rakai.

Slaymaker E, Bwanika JB, Kasamba I, Lutalo T, Maher D, Todd J - Sex Transm Infect (2009)

Survival curves (cumulative proportion who have had sex by age) for men and                        women born since 1970 by 5-year birth cohorts. (A) Pooled Demographic and                        Health Survey data; (B) Masaka study; (C) Rakai study.
© Copyright Policy - openaccess
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC2654114&req=5

U9G-85-S1-0012-f02: Survival curves (cumulative proportion who have had sex by age) for men and women born since 1970 by 5-year birth cohorts. (A) Pooled Demographic and Health Survey data; (B) Masaka study; (C) Rakai study.
Mentions: In restricting the analysis to those born after 1 January 1970, the survival curves for 5-year birth cohorts are shown in fig 2 and the relative hazards in table 4. In the DHS and Masaka studies, men and women in the later cohorts (those born in 1980–4 and 1985–9) had delayed AFS (fig 2). The Rakai data show the opposite, with the later cohorts having earlier AFS. This pattern is clearly seen in the hazard ratios for AFS in table 4, which shows increased hazard in the later cohorts in Rakai but reduced hazards in the DHS and Masaka studies.

Bottom Line: Successive male cohorts in Masaka appeared first to have an increased AFS which subsequently decreased, a trend that was also apparent (but not significant) in the DHS data.For men, AFS has not changed consistently over the period in question.Differences between Masaka and Rakai may reflect socioeconomic differences.

View Article: PubMed Central - PubMed

Affiliation: Centre for Population Studies, London School of Hygiene and Tropical Medicine, London, UK. emma.slaymaker@lshtm.ac.uk

ABSTRACT

Objectives: To derive the best possible estimates of trends in age at first sex (AFS) among successive cohorts of Ugandan men and women based on all the data available from the Demographic and Health Surveys (DHS) and cohort studies in Masaka and Rakai districts.

Methods: The datasets from the DHS, Masaka cohort and Rakai cohort were analysed separately. Survival analysis methods were used to estimate median AFS for men and women born in the 1950s-1980s and to compute hazard ratios for first sex, comparing later cohorts with earlier cohorts.

Results: The DHS and Masaka data showed an increase in AFS in women in the more recent birth cohorts compared with those born before 1970, but this was less apparent in the Rakai data. Successive male cohorts in Masaka appeared first to have an increased AFS which subsequently decreased, a trend that was also apparent (but not significant) in the DHS data. Younger men in Rakai had an earlier AFS than those born before 1980.

Conclusions: Women in Uganda who were born after 1970 have, on average, had sex at a later age than those born earlier. For men, AFS has not changed consistently over the period in question. Differences between Masaka and Rakai may reflect socioeconomic differences. Most of the change in AFS occurred too late to have contributed to the initial decline in the incidence of HIV.

Show MeSH