Effectiveness and long-term stability of outpatient cognitive behavioural therapy (CBT) for children and adolescents with anxiety and depressive disorders under routine care conditions.

ABSTRACT

BACKGROUND: Randomised controlled trials (RCTs) have provided considerable evidence for the short-term efficacy of cognitive behavioural therapy (CBT) in children and adolescents with depressive and anxiety disorders. However, the effectiveness and long-term stability of treatment effects under routine care conditions remain unproven. AIMS: This observational study investigates the effectiveness and stability of CBT under routine care conditions within a large sample of clinically referred youth with depressive and anxiety disorders. METHOD: Two hundred and twenty former patients (age 6-18 years at start of treatment) underwent a follow-up assessment (follow-up interval M=5.3 years, SD=2.47). Parent and self-ratings of behavioural and emotional problems were obtained at the beginning and end of treatment and at follow-up. Additionally, at follow-up, a telephone interview and questionnaires exploring other mental symptoms and life satisfaction were administered. RESULTS: A repeated measures ANOVA yielded statistically significant, medium to large pre- post symptom reductions (ηp2=.15 to ηp²=.47) and small to medium post-follow-up symptom reductions (ηp²=.03 to ηp²=.19). At follow-up, between 57 and 70% of the sample reported a decrease in different emotional symptoms since the end of treatment, and 80% reported improved life satisfaction. CONCLUSIONS: These findings provide evidence for the effectiveness and stability of treatment effects of CBT in youth with depressive and anxiety disorders under routine care conditions. Due to the lack of a direct control condition and a substantial proportion of missing data, the results must be interpreted with caution.