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Power Calculation for Survival Analyses*
|
Proposed study population |
|||||||||
|---|---|---|---|---|---|---|---|---|---|
| 350 | 400 | ||||||||
| |
% exposed |
10% |
20% |
30% |
40% |
10% |
20% |
30% |
40% |
|
Hazard ratio |
1.5 |
0.31 |
0.59 |
0.74 |
0.8 |
0.37 |
0.66 |
0.8 |
0.85 |
| |
2 |
0.79 |
0.98 |
0.99 |
0.99 |
0.86 |
0.99 |
0.99 |
0.99 |
| 2.5 | 0.98 | 0.99 | 0.99 | 1 | 0.99 | 0.99 | 1 | 1 | |
*assuming an alpha of 0.05, follow-up over 3 years, and a 10% drop out in either group.
