Table 2 Power estimation considering 4 steps, 1 cluster in each step, a CAC of 90% and a cluster size of 300 women (coefficient of variation of cluster size 0.60)
Baseline CS rate in Robson Group 1 | ICC | Relative reduction | |||
|---|---|---|---|---|---|
35% | 30% | 25% | 20% | ||
40%* | 0.01 | 100% | 99% | 97% | 86% |
0.02 | 100% | 99% | 92% | 76% | |
0.05 | 96% | 88% | 74% | 54% | |
30%** | 0.01 | 99% | 96% | 88% | 70% |
0.02 | 97% | 91% | 78% | 58% | |
0.05 | 85% | 73% | 56% | 38% | |