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Table 7 Sample size

From: The CORONIS Trial. International study of caesarean section surgical techniques: a randomised fractional, factorial trial

Incidence in control group Incidence in intervention group Risk ratio Total sample size needed for analysis of each comparison
15% 18% 1.20 4,936
15% 17% 1.13 10,746
15% 13% 0.87 9,646
15% 12.75% 0.85 7,586
15% 12% 0.80 4,204
15% 11% 0.73 2,316
  1. Sample sizes required for 15% incidence of primary outcome in control group, with 80% power