Objective: To compare the predictive validity and clinical utility of DSM-IV somatoform disorders and DSM-5 Somatic Symptom Disorder (SSD) at 12-month follow-up.
Methods: In a sample of psychosomatic inpatients (n=322, mean age=45.6 years (SD 10.0), 60.6% females) we prospectively investigated DSM-IV somatoform disorders and the DSM-5 diagnosis of SSD plus a variety of psychological characteristics, somatic symptom severity, and health-related quality of life at admission, discharge, and follow-up.
Results: DSM-IV diagnoses and DSM-5 SSD similarly predicted physical functioning at follow-up; SSD also predicted mental functioning at follow-up. Bodily weakness, intolerance of bodily complaints, health habits, and somatic attribution at admission were significant predictors of physical functioning at follow-up. The change in physical functioning during inpatient therapy was a significant predictor for the course of physical functioning until follow-up.
Conclusions: Psychological symptoms appear to be predictively valid diagnostic criteria for the 12-month functional outcome in patients with SSD. Mental functioning can be better predicted by the DSM-5 diagnosis than by DSM-IV diagnoses. Not the change in single psychological features but in physical functioning during the treatment interval predicted the change in physical functioning until follow-up.
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