What proportion of primary psychiatric interventions are based on evidence from randomised controlled trials?

Objectives-To estimate the proportion of psychiatric inpatients receiving primary interventions based on randomised controlled trials or systematic reviews of randomised controlled trials. Design-Retrospective survey. Setting-Acute adult general psychiatric ward. Subjects-All patients admitted to the ward during a 28 day period. Main outcome measures-Primary interventions were classified according to whether or not they were supported by evidence from randomised controlled trials or systematic reviews. Results-The primary interventions received by 26/40 (65%; 95% confidence interval (95% CI) 51% to 79%) of patients admitted during the period were based on randomised trials or systematic reviews. Conclusions-When patients were used as the denominator, most primary interventions given in acute general psychiatry were based on experimental evidence. The evidence was difficult to locate; there is an urgent need for systematic reviews of randomised controlled trials in this area.