Objective
In this study, we aimed to expand on our prior research into the relative efficacy of combining parent training, stimulant medication and placebo (Basic) versus parent training, stimulant, and risperidone (Augmented) therapy by examining treatment effects for attention-deficit/hyperactivity disorder (ADHD), oppositional defiant disorder (ODD), and conduct disorder (CD) symptoms and peer aggression, symptom-induced—impairment, and informant discrepancy.
Method
Children (6-12 years; N=168) with severe physical aggression, ADHD, and co-occurring ODD/CD received an open trial of parent training and stimulant medication for 3 weeks. Participants failing to show optimal clinical response were randomly assigned to Basic or Augmented therapy for an additional 6 weeks.
Results
Compared with Basic therapy, children receiving Augmented therapy experienced greater reduction in parent-rated ODD severity (p=.02, Cohen's d=0.27) and peer aggression (p=.02, Cohen's d=0.32), but not ADHD or CD symptoms. Fewer children receiving Augmented (16%) than Basic (40%) therapy were rated by their parents as impaired by ODD symptoms at Week 9/endpoint (p=.008). Teacher ratings indicated greater reduction in ADHD severity (p=.02, Cohen's d =0.61) with Augmented therapy, but not for ODD or CD symptoms or peer aggression. Although both interventions were associated with marked symptom reduction, a relatively large percentage of children were rated impaired for at least one targeted disorder at Week 9/endpoint by parents (Basic 47%; Augmented 27%) and teachers (Basic 48%; Augmented 38%).
Conclusion
Augmented was superior to Basic therapy in reducing severity of ADHD and ODD symptoms, peer aggression, and symptom-induced impairment, but clinical improvement was generally context-specific, and effect sizes ranged from small to moderate.