[Extensions of the outpatient psychotherapy: a study about patient, therapist, treatment, and therapy course characteristics].

Due to the treatment costs, extensions of the standard therapy duration are a matter of critical examination. This study investigates which factors characterize patients with treatment extensions in the German health system and how effective these extensions are for a reduction of the patients' symptoms. We analysed a disorder heterogeneous sample of 810 patients. We found that therapy extensions are more common among with more severe mental disorders, when the therapeutic relationship is positive, and little therapy success has been achieved during the standard duration. Overall, the findings suggest that outpatient psychotherapy is mainly extended for patients with a low symptom reduction after the standard therapy duration and that therapy extension allows a symptom reduction that could not have been achieved otherwise. © Georg Thieme Verlag KG Stuttgart · New York.