An effectiveness study of individual vs. group cognitive behavioral therapy for anxiety disorders in youth.

OBJECTIVE Conducted a randomized controlled trial to investigate the effectiveness of cognitive behavioral therapy (CBT), and compared the relative effectiveness of individual (ICBT) and group (GCBT) treatment approaches for anxiety disorders in children and adolescents. METHODS Referred youth (N = 182, M age = 11.5 years, range 8-15 years, 53% girls) with separation anxiety, social phobia, or generalized anxiety disorder were randomly assigned to ICBT, GCBT or a waitlist control (WLC) in community clinics. Pre-, post-, and one year follow-up assessments included youth and parent completed diagnostic interview and symptom measures. After comparing CBT (ICBT and GCBT combined) to WLC, ICBT and GCBT were compared along diagnostic recovery rates, clinically significant improvement, and symptom measures scores using traditional hypothesis tests, as well as statistical equivalence tests. RESULTS Significantly more youth lost all anxiety disorders after CBT compared to WLC. Full diagnostic recovery rate was 25.3% for ICBT and 20.5% in GCBT, which was not significantly different. There was continued lack of significant differences between ICBT and GCBT at one year follow-up. However, equivalence between GCBT and ICBT could only be demonstrated for clinical severity rating of the principal anxiety disorder and child reported anxiety symptoms post-treatment. CONCLUSION Findings support the effectiveness of CBT compared to no intervention for youth with anxiety disorders, with no significant differences between ICBT and GCBT. However, the relatively low recovery rates highlight the need for further improvement of CBT programs and their transportability from university to community settings.