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Table 2 Detectable reduction in composite HIV/STI incidence over 24 months (N=1500, 80% power, 20% attrition, two-sided α=.05)

From: A savings intervention to reduce men’s engagement in HIV risk behaviors: study protocol for a randomized controlled trial

 

Scenario

Composite HIV/STI incidence rate in the control group (per 12 months)

15%

17%

20%

Composite HIV/STI incidence rate in the control group (per 24 months)

28%

31%

36%

Detectable relative reduction in composite incidence (relative to control)a

0.25

0.23

0.21

  1. a1 − (rate in the intervention group)/(rate in the control group)
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Trials

ISSN: 1745-6215