Cognitive therapy (CT) v a self help booklet (SHB) or repeated assessments (RA) for preventing chronic post-traumatic stress disorder (PTSD)*
| Outcome at 3 months | Comparison | Event rates | RRR (95% CI) | NNT (CI) |
|---|---|---|---|---|
| *Abbreviations defined in glossary; RRR, NNT, and CI calculated from data in article. | ||||
| Patients with PTSD | CT v RA | 21% v 72% | 70% (42 to 86) | 2 (2 to 4) |
| CT v SHB | 21% v 79% | 73% (47 to 87) | 2 (2 to 4) | |