Implementing Transdiagnostic Well-Being Therapy (WBT) in a Multidisciplinary Psychiatric Day Clinic: Feasibility, Preliminary Efficacy, and Correlates of Treatment Response – Pre-Analysis Plan

Pre-analysis plan for the first author’s master’s thesis (Ludwig-Maximilians-Universität München). The study is a prospective, single-arm feasibility trial of a transdiagnostic Well-Being Therapy (WBT) group program delivered by a multidisciplinary team in a general psychiatric day clinic (LMU Klinikum, Munich; ethics approval 24-0359; DRKS00034724). The plan specifies research questions, prespecified progression criteria, and analyses for feasibility and acceptability, preliminary efficacy (primary outcome: WHO-5), and correlates of treatment response.