Cognitive therapy (CT) v a self help booklet (SHB) or repeated assessments (RA) for preventing chronic post-traumatic stress disorder (PTSD)*

Outcome at 3 monthsComparisonEvent ratesRRR (95% CI)NNT (CI)
*Abbreviations defined in glossary; RRR, NNT, and CI calculated from data in article.
Patients with PTSDCT v RA21% v 72%70% (42 to 86)2 (2 to 4)
CT v SHB21% v 79%73% (47 to 87)2 (2 to 4)