Benefits of cognitive-behavioural therapy for children and youth with obsessive-compulsive disorder: re-examination of the evidence.

The aim of the present paper was to critically examine evidence about the benefits of cognitive-behavioural therapy (CBT) for pediatric obsessive-compulsive disorder (OCD) from controlled and single group studies, including its benefits relative to medication are critically reviewed. Selected studies were categorized by study type and by risk of bias classification. Standardized mean differences (Hedges' g or Cohen d) and, where appropriate, weighted mean difference (WMD) were calculated. All five comparison and 14 one-group studies showed a significant benefit for CBT within a wide range (ES = .78 to 4.38). Low risk of bias studies produced the lower adjusted effect sizes. The best available estimate of CBT efficacy relative to no treatment is about 1 standardized mean difference, equivalent to a treatment effect of 8 points on the Children's Yale-Brown Obsessive-Compulsive Scale. This represents a reduction in the risk of continuing to have OCD post-treatment of about 37% (95% CI 14% to 54%). Evidence from 3 studies indicates that the efficacy of CBT and medication do not differ significantly. CBT combined with medication is significantly more efficacious than non-active controls or medication alone but not relative to CBT alone. CBT should be regarded as a first line equivalent to anti-OCD medication with the potential to lead to better outcomes when combined with medication than medication alone can provide. Additional studies are needed to further clarify CBT's benefits and to investigate how it can be made more available as a treatment option for children and youth who suffer from OCD.