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

Huf et al. BMC Psychiatry 2002 2:11   doi:10.1186/1471-244X-2-11