From: Interim analysis for binary outcome trials with a long fixed follow-up time and repeated outcome assessments at pre-specified times
Standard group event proportion (π0)
Experimental group event proportion (π1)
Absolute risk reduction (π0-π1)
N
0.30
0.25
0.05
3342
0.20
0.10
796
160
0.50
0.45
4182
0.40
1030
242