Table 1

Power analysis 

OutcomeBaseline sample, % (n)Control proportion, %Minimum detectable change if
ICC=0.01
change, % (h)
ICC=0.05
change, % (h)
ICC=0.09
change, % (h)
Receive effective method at visit*40 (560)42+13 (0.269)+18 (0.370)+22 (0.446)
Use effective method at 3 months60 (840)27+11 (0.232)+16 (0.346)+21 (0.428)
Use effective method at 6 months50 (700)27+12 (0.246)+17 (0.356)+21 (0.436)
  • *Method efficacy is based on WHO criteria.

  • ICC, intraclass correlation coefficient.