Table 1.
Calculated statistical power for varying sample sizes for two different survival scenarios, assuming no loss to follow-up.
| Median survival timea | Total N | Power |
| 9 | 10 | .089 |
| 9 | 20 | .128 |
| 9 | 30 | .169 |
| 9 | 40 | .210 |
| 9 | 50 | .250 |
| 9 | 60 | .291 |
| 9 | 80 | .369 |
| 9 | 100 | .443 |
| 9 | 120 | .512 |
| 9 | 140 | .576 |
| 9 | 160 | .633 |
| 9 | 180 | .684 |
| 9 | 200 | .729 |
| 9 | 220 | .769 |
| 9 | 240 | .804 |
| 9 | 260 | .834 |
| 9 | 280 | .860 |
| 9 | 300 | .883 |
| 9 | 320 | .902 |
| 9 | 350 | .925 |
| 9 | 370 | .938 |
| 9 | 400 | .953 |
| 12 | 10 | .158 |
| 12 | 20 | .269 |
| 12 | 30 | .376 |
| 12 | 40 | .475 |
| 12 | 50 | .564 |
| 12 | 60 | .642 |
| 12 | 80 | .765 |
| 12 | 100 | .851 |
| 12 | 120 | .908 |
| 12 | 140 | .944 |
| 12 | 160 | .967 |
| 12 | 180 | .981 |
| 12 | 200 | .989 |
| 12 | 220 | .994 |
| 12 | 240 | .996 |
| 12 | 260 | .998 |
| 12 | 280 | .999 |
| 12 | 300 | >.999 |
| 12 | 320 | >.999 |
| 12 | 350 | >.999 |
| 12 | 370 | >.999 |
| 12 | 400 | >.999 |
aCompared to a group of patients with median survival of 6 months using log-rank test for equality of survival curves. Power was calculated assuming equal number of patients in each treatment group, significance level at .05 in a two-sided test, and no loss to follow-up.