[Treatment Evaluation in Inpatient Psychiatry: Transdiagnostic Factors as Correlates of Treatment Outcome - Implications for Clinical Practice and for Effectiveness Research].

AIM An inpatient psychiatric-psychotherapeutic treatment was evaluated in a naturalistic setting (effectiveness research). Transdiagnostic factors were examined as correlates of treatment outcome. METHODS Self-report questionnaires were administered at the beginning and the end of the inpatient treatment. The sample (N = 378) consisted of women and men (16-80 years, M = 40.4, SD = 15.8) with primary diagnoses of depressive, anxiety or eating disorders. The average treatment duration was 8.2 weeks (SD = 3.8). Primary outcome variables were severity of symptoms and level of psychosocial functioning. As transdiagnostic correlates, self-esteem, self-efficacy, and emotion regulation were included in the regression analyses. RESULTS The change in transdiagnostic factors explained a significant proportion of the treatment outcome (explained variance: 8-27 % self-efficacy, 23-42 % self-esteem, 10-26 % emotion regulation). DISCUSSION/CONCLUSION The present study shows that the evaluation of a treatment in a naturalistic clinical setting is feasible. Transdiagnostic factors explained a substantial part of the statistical variance in treatment outcome across all disorders. Even if the present study design does not allow conclusions about causality, the results underline the relevance of transdiagnostic trainings (e. g., in emotion regulation) to improve effectiveness of treatment approaches.