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. Author manuscript; available in PMC: 2020 Jan 1.
Published in final edited form as: Curr Opin HIV AIDS. 2020 Jan;15(1):56–60. doi: 10.1097/COH.0000000000000589

Table 1:

Trial Sizes and Power Calculation for Active Controlled Trials with TDF/FTC Control Groups

Trial Incidence Rate Ratio Required
Null Hypothesis Alternative Hypothesis Incident HIV+ Participants Person Years
DISCOVER*,1 1.62 1.00 106 5,400 8,756
HTPN 083+,1 1.23 0.75 174 4,500 10,400
HPTN 084+2 1.00 0.54 111 3,200 7,200
+

randomization: Injectable cabotegravir v. Daily oral tenofovir disproxil fumerate/emtricitabine

*

randomization: Daily oral tenofovir alafenamide/emtricitabine v. Daily oral tenofovir/emtricitabine

1.

Population: men who have sex with men and transgender women

2.

Population: cis women in subsaharan Africa