Estimates of prevalence of chlamydia Infection i) for all participants and ii) those reporting sexual activity, by gender, with and without sensitivity test for bias due to missing data.

Notes: aData were multiply imputed for the 9568 participants who attended the study clinic.
bThe number of cases of chlamydia among participants reporting sexual activity is 16, rather than 20, because four participants who tested positive for chlamydia did not respond to the question on sexual activity.