Table 1.

Response and dropout rates according to different criteria in the antipsychotic-treated and placebo-treated groups as reported in a comprehensive meta-analysis of placebo-controlled antipsychotic drug trials in acute schizophrenia (data from Leucht et al.⁹).

Outcome	% of patients treated with antipsychotic	% of patients treated with placebo	No. of studies	Total sample	Number needed to treat to benefit (NNT) (credible interval)
Minimal response	51	30	46	8918	5 (4–5)
Good response	23	14	38	8403	8 (6–11)
Stopping treatment: any reason	38	56	105	22,851	11 (9–14)
Stopping treatment: inefficacy	13	26	94	23,017	7 (6–9)