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Table 1 Study power to detect a 30–50% reduction in HIV incidence in DREAMS+PrEP cohort compared to incidence in a comparison cohort with at least 690 YWSS followed up over 24 months (1500–1380 person-years follow-up/cohort)

From: Evaluating the impact of DREAMS on HIV incidence among young women who sell sex: protocol for a non-randomised study in Zimbabwe

HIV incidence in comparison cohort Reduction in HIV incidence in DREAMS+PrEP cohort
50% 40% 30% 50% 40% 30%
1500pyrs follow-up per cohort 1380pyrs follow-up per cohort
5.0 94 77 49 92 75 46
6.0 96 85 59 96 82 55
7.0 98 90 66 98 87 62
8.0 99 93 72 99 91 67