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Comparative assessment of the quality of age-at-event reporting in three HIV cohort studies in sub-Saharan Africa.

Wringe A, Cremin I, Todd J, McGrath N, Kasamba I, Herbst K, Mushore P, Zaba B, Slaymaker E - Sex Transm Infect (2009)

Bottom Line: Inclusion of unreliable reports had little effect on estimates of median age-at-event in all sites.There was some evidence from the 1960-9 birth cohort that women in Uganda and both sexes in South Africa reported later AFS as they aged.Although reporting quality is unlikely to affect comparisons of AFS and AFM between settings, care should be taken not to overinterpret small changes in reported age-at-event over time within each site.

View Article: PubMed Central - PubMed

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

ABSTRACT

Objectives: To assess inconsistencies in reported age at first sex (AFS) and age at first marriage (AFM) in three African cohorts, and consider their implications for interpreting trends in sexual and marital debut.

Methods: Data were analysed from population-based cohort studies in Zimbabwe, Uganda and South Africa with 3, 10 and 4 behavioural survey rounds, respectively. Three rounds over a similar time frame were selected from each site for comparative purposes. The consistency of AFS and AFM reports was assessed for each site by comparing responses made by participants in multiple surveys. Respondents were defined as unreliable if less than half of all their age-at-event reports were the same. Kaplan-Meier functions were used to describe the cumulative proportion (1) having had sex and (2) married by age, stratified by sex, birth cohort and site, to compare the influence of reporting inconsistencies on these estimates.

Results: Among participants attending all three comparable rounds, the percentage with unreliable AFS reports ranged from 30% among South African women to 56% among Zimbabwean men, with similar patterns observed for AFM. Inclusion of unreliable reports had little effect on estimates of median age-at-event in all sites. There was some evidence from the 1960-9 birth cohort that women in Uganda and both sexes in South Africa reported later AFS as they aged.

Conclusion: Although reporting quality is unlikely to affect comparisons of AFS and AFM between settings, care should be taken not to overinterpret small changes in reported age-at-event over time within each site.

Show MeSH
Differences in reported age at first sex (AFS) (left panels) and reported age at first marriage (AFM) (right panels) between consecutive comparison rounds by birth cohort, sex and site among those who reported in all three of the comparative rounds. The box plots show the interquartile range of values for this difference with the horizontal line within each box representing the median difference and the external vertical lines signifying the maximum and minimum reported age difference within each category.
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U9G-85-S1-0056-f02: Differences in reported age at first sex (AFS) (left panels) and reported age at first marriage (AFM) (right panels) between consecutive comparison rounds by birth cohort, sex and site among those who reported in all three of the comparative rounds. The box plots show the interquartile range of values for this difference with the horizontal line within each box representing the median difference and the external vertical lines signifying the maximum and minimum reported age difference within each category.

Mentions: Figure 2 shows the differences in reported age-at-event between each of the rounds used for the comparative analysis by sex, birth cohort and site among those who had reported in all three of the comparative rounds. For both AFS and AFM, these figures show that, despite considerable differences in reported age-at-event between the three comparative rounds (particularly among men), the median difference in reported ages was consistently close to zero for both sexes.


Comparative assessment of the quality of age-at-event reporting in three HIV cohort studies in sub-Saharan Africa.

Wringe A, Cremin I, Todd J, McGrath N, Kasamba I, Herbst K, Mushore P, Zaba B, Slaymaker E - Sex Transm Infect (2009)

Differences in reported age at first sex (AFS) (left panels) and reported age at first marriage (AFM) (right panels) between consecutive comparison rounds by birth cohort, sex and site among those who reported in all three of the comparative rounds. The box plots show the interquartile range of values for this difference with the horizontal line within each box representing the median difference and the external vertical lines signifying the maximum and minimum reported age difference within each category.
© Copyright Policy - openaccess
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC2654104&req=5

U9G-85-S1-0056-f02: Differences in reported age at first sex (AFS) (left panels) and reported age at first marriage (AFM) (right panels) between consecutive comparison rounds by birth cohort, sex and site among those who reported in all three of the comparative rounds. The box plots show the interquartile range of values for this difference with the horizontal line within each box representing the median difference and the external vertical lines signifying the maximum and minimum reported age difference within each category.
Mentions: Figure 2 shows the differences in reported age-at-event between each of the rounds used for the comparative analysis by sex, birth cohort and site among those who had reported in all three of the comparative rounds. For both AFS and AFM, these figures show that, despite considerable differences in reported age-at-event between the three comparative rounds (particularly among men), the median difference in reported ages was consistently close to zero for both sexes.

Bottom Line: Inclusion of unreliable reports had little effect on estimates of median age-at-event in all sites.There was some evidence from the 1960-9 birth cohort that women in Uganda and both sexes in South Africa reported later AFS as they aged.Although reporting quality is unlikely to affect comparisons of AFS and AFM between settings, care should be taken not to overinterpret small changes in reported age-at-event over time within each site.

View Article: PubMed Central - PubMed

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

ABSTRACT

Objectives: To assess inconsistencies in reported age at first sex (AFS) and age at first marriage (AFM) in three African cohorts, and consider their implications for interpreting trends in sexual and marital debut.

Methods: Data were analysed from population-based cohort studies in Zimbabwe, Uganda and South Africa with 3, 10 and 4 behavioural survey rounds, respectively. Three rounds over a similar time frame were selected from each site for comparative purposes. The consistency of AFS and AFM reports was assessed for each site by comparing responses made by participants in multiple surveys. Respondents were defined as unreliable if less than half of all their age-at-event reports were the same. Kaplan-Meier functions were used to describe the cumulative proportion (1) having had sex and (2) married by age, stratified by sex, birth cohort and site, to compare the influence of reporting inconsistencies on these estimates.

Results: Among participants attending all three comparable rounds, the percentage with unreliable AFS reports ranged from 30% among South African women to 56% among Zimbabwean men, with similar patterns observed for AFM. Inclusion of unreliable reports had little effect on estimates of median age-at-event in all sites. There was some evidence from the 1960-9 birth cohort that women in Uganda and both sexes in South Africa reported later AFS as they aged.

Conclusion: Although reporting quality is unlikely to affect comparisons of AFS and AFM between settings, care should be taken not to overinterpret small changes in reported age-at-event over time within each site.

Show MeSH