Therapy Amount and Outcome of Inpatient Psychodynamic Treatment of Eating Disorders in Germany: Data From a Multicenter Study

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Abstract
The present study investigates (a) factors that determine length of treatment and (b) the effect of treatment duration and other factors on outcome for patients with eating disorders. In this observational study, the symptomatic status of 1,171 patients was observed for 2.5 years after admission to 1 of 43 participating hospitals. Treatment and outcome were modeled using hierarchical linear models and logistic regression. To control for possible confounding factors, propensity score adjustment was used. Treatment modalities, especially length and intensity, varied considerably between and within hospitals and were related to patient characteristics to a very small degree. At 2.5-year follow-up, 33% of anorexia patients and 25% of bulimia patients were symptom free. Length of treatment showed a weak effect on outcome and only in interaction with other patient characteristics of relevance, whereas treatment intensity was not related to outcome. Implications for treatment planning are discussed.

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