The objective was to address aspects of the SCEPTRE study that had been left unexplored so far and which have not yet been addressed in earlier publications. We formulated the following three research questions:
1. Are the improvements previously observed in patients with a cluster A, B, or C PD or PDNOS stable over five years of follow-up? Are there differences in the effectiveness of outpatient, day hospital, and inpatient treatments on the long-term outcome in patients with a cluster A, B, or C PD or PDNOS?
2. What are the effectiveness and cost-effectiveness of Short-Term Inpatient Psychotherapy based on Transactional Analysis (STIP-TA) in PD patients?
3. Is there an interaction between the patient’s psychological strength and the treatment’s level of destabilization with respect to outcome?