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Sample size requirements for different scenarios. Sample size is calculated using 90% power and 5% alpha |
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| Strategy |
Intervention rate |
Event rate in control arm of trial |
Sample size (pts. screened) for relative risk of 0.75 |
|
|
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| Treat high-risk (risk 10% +) |
52.60% |
34.6% |
1228 (2335) |
| Treat high-risk (risk 25% +) |
27.20% |
52.9% |
624 (2294) |
| Treat high-risk (risk 50% +) |
12.60% |
74.6% |
292 (2317) |
| Treat all |
100.00% |
20.0% |
2504 (2504) |
Vickers et al. Trials 2006 7:30 doi:10.1186/1745-6215-7-30 |
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