Table 9 Sample size needed to detect an absolute difference of 15% in the proportion of tranquillised patients (α = 5%, power = 80%).
Haloperidol + promethazine (% tranquilised) | Midazolam (% tranquilised) | N |
|---|---|---|
5 | 20 | 152 |
10 | 25 | 200 |
15 | 30 | 242 |
20 | 35 | 276 |
25 | 40 | 304 |
30 | 45 | 326 |
35 | 50 | 340 |