Half-width of CIs for differences in proportions between two groups with given sample size, placebo group, p=0.5 (created with PASS software REF—PASS V.15)
| Difference | 0.1 | 0.2 | 0.3 | 0.4 | 0.5 |
| Width | 0.398 | 0.392 | 0.382 | 0.337 | 0.347 |
The half-width of the 95% CI of the difference in means for continuous outcome will be 0.889 SD.