Treatment response for lithium augmentation v placebo for refractory depression†

StudiesWeighted event ratesRBI (95% CI)NNT (CI)
†Abbreviations defined in glossary. Event rates calculated from data in article and data supplied by author.
LithiumPlacebo
3 studies with sufficient dose and duration of lithium 50%23%114% (23 to 270)4 (3 to 11)
All 9 studies46%17%125% (45 to 251)4 (3 to 6)