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Table 3 Power (%) to detect a difference between BT and nBT groups in Randomisation A

From: Protocol, rationale and design of SELPHI: a randomised controlled trial assessing whether offering free HIV self-testing kits via the internet increases the rate of HIV diagnosis

Diagnosis rate in nBT group (%) Diagnosis rate in BT group (%)
50 60 70 80
20 91 99 100 100
30 53 83 96 99
40 16 45 75 92
50 5 14 39 68
  1. Power to detect a difference at 2α = 0.05 by chi-squared test
  2. Assumes seroprevalence rate = 2%