From: An investigation of the impact of futility analysis in publicly funded trials
Number of patients saved (after inflation in sample size) | Stopping boundary | |||
---|---|---|---|---|
20% | 30% | 40% | ||
Proportion of patients recruited | 50% | 0 | 0 | 0 |
60% | 0 | 325 | 751 | |
70% | 342 | 686 | 1,027 | |
75% | 634 | 807 | 1,390 | |
80% | 512 | 667 | 1,145 | |
 | 90% | 467 | 570 | 711 |