Article Figures & Data
Tables
Quality Type of Evidence 1a (best) Systematic review of RCTs 1b Individual RCT with narrow confidence interval 1c “All-or-none” case series 2a Systematic review of cohort studies 2b Individual cohort study RCT with <80% follow-up 2c Outcomes research Ecological study 3a Systematic review of case-control studies 3b Individual case-control study 4 Case series 5 (worst) Expert opinion -
RCT, randomized control trial.
Reprinted with permission from Gray GE: Evidence-Based Psychiatry. Arlington, VA: American Psychiatric Publishing, 2004
-