LAUSR

Effectiveness of psychodynamic therapy for adolescents in reducing internalizing and externalizing psychopathology was determined by comparing treated adolescents (86 sessions) with the normative developmental progression in two groups without treatment: healthy and diabetic adolescents. In a three-wave longitudinal study, n = 531 adolescents (n = 303 patients, n = 119 healthy, n = 109 diabetics) and their mothers filled out psychopathology questionnaires (Youth Self-Report and Child Behavior Checklist). Latent growth curve modeling and multilevel modeling were used to analyze and compare within-person symptoms changes across groups. Analyses showed a significant reduction over the course of treatment for internalizing (Cohen's d = .90-.92) and externalizing (d = .58-.72) symptoms, also when the developmental progression of both control groups was accounted for (d = .48-.76). Mothers reported lower levels than their children in internalizing symptoms (p ≤ .01) while this discrepancy increased over time for treated adolescents (p = .02). Results established the effectiveness of psychodynamic treatment for adolescents both with externalizing and internalizing symptoms in comparison with growth and change in nonclinical samples. Cross-informant differences and age-specific trajectories require attention in psychotherapy treatment and research.