Supplementary Material for: Overcoming Treatment Resistance in Chronic Depression: A Pilot Study on Outcome and Feasibility of the Cognitive Behavioral Analysis System of Psychotherapy as an Inpatient Treatment Program

<b><i>Background:</i></b> The Cognitive Behavioral Analysis System of Psychotherapy (CBASP), initially developed as an outpatient treatment for chronic depression (CD), has been adapted as a multidisciplinary 12-week inpatient program for CD. <b><i>Methods:</i></b> Seventy inpatients with CD and treatment resistance were included in a noncontrolled trial. The Hamilton Depression Rating Scale served as the primary outcome measure. Prospective naturalistic follow-up assessments were conducted 6 and 12 months after discharge. <b><i>Results:</i></b> Dropout rate was 7.1%; 90.4% perceived the program as helpful. Pre-post comparisons yielded strong effect sizes; 75.7% of the intention-to-treat sample responded, and 40.0% remitted. Nonremission was associated with experiencing temporary deterioration of symptoms during treatment. After 6 months 75.0% and after 12 months 48.0% of patients sustained response. <b><i>Conclusions:</i></b> The CBASP program appears as a feasible acute treatment for treatment-resistant CD inpatients with promising outcome. However, the continuation of treatment after discharge should be optimized especially for patients with subjective deterioration during treatment.