Objective: To determine the treatment effect of psychodynamic therapy for adolescents in comparison to normative developmental progression in two groups without treatment: healthy adolescents and adolescents with juvenile diabetes.
Research design and methods: In a 3-wave longitudinal study, n = 531 adolescents (n = 303 treated adolescents, n = 119 healthy, n = 109 with diabetes) and their parents filled out psychopathology questionnaires (Youth Self-Report [YSR] and Child Behaviour Checklist [CBCL]). Growth curve modeling (GCM) was used to examine within-person change in psychopathology while controlling for stable between-person differences.
Results: GCM analyses revealed significant within-person reductions in patients' YSR and CBCL (d = 1.02-1.99) at the end of treatment. When accounted for the control groups' developmental progression (d = .14-.94), patients' within-person change remained significantly higher (d = .48-.82). In all three groups, parents rated the severity of psychopathology significantly lower, and within-person change significantly higher than the adolescents him/herself.
Conclusions: Psychodynamic therapy led to a significant symptom reduction in treated adolescents and was superior to development-related symptom changes occurring in the two control groups. Hence, clinically relevant symptoms in adolescents do not "grow out", but require psychotherapeutic treatment. Differences between adolescents and their parents in the evaluation of symptom severity and change require attention in psychotherapy treatment and research.
Keywords: adolescent patients; healthy controls; juvenile diabetes; parents report; psychodynamic therapy; self-report.