A Cochrane review included 11 studies with 943 subjects. The interventions included written information and videotapes. In general, media-based therapies for behavioural disorders in children had a moderate, if variable, effect when compared with both no-treatment controls with effects sizes ranging from –0.12 (–1.65, 1.41) to –32.60 (–49.93, –15.27) and as and adjunct to medication with effect sizes ranging from –2.71 (–5.86, –0.44) to –39.55 (–75.01, –4.09). Significant improvements were made with the addition of up to two hours of therapist time.