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To obtain estimates of the relative efficacy of 3 main treatment strategies for attention-deficit hyperactivity disorder (ADHD) in children and youth (age < 18 years).

Design: quantitative systematic review of randomized trials. Subjects: 999 patients with ADHD from 26 randomized trials. Interventions: medications alone, behavioural interventions alone, and a combination of these 2 modalities. Main outcome measure: differences in scores between treatment groups on commonly used teacher- and parent-completed behaviour rating scales.

Medication-only therapy was efficacious in ADHD. Behavioural therapies used alone appeared not to be efficacious in ADHD. Combination therapy was more efficacious than placebo or no treatment for parent but not teacher ratings, not more efficacious than drug therapy alone, and more efficacious than behavioural treatments alone based on parent but not …