Clinical effectiveness of metacognitive training as a transdiagnostic program in routine clinical settings: A prospective, multicenter, single‐group study

Aim To evaluate the clinical effectiveness of metacognitive training (MCT) as a transdiagnostic program, on a diverse population with mental disorders in routine Japanese day‐care settings. Methods This study employed a prospective, multicenter, single‐group pre‐post design. Participants diagnosed with various mental disorders received 10 MCT group sessions. We set transdiagnostic outcomes to assess quality of life, global functioning, cognitive insight, and depressive symptoms. At the end of the MCT, we also evaluated participants' satisfaction with treatment. Assessments were conducted at baseline (Pre), Week 5 (Mid), Week 10 (Post), and Week 14 (follow‐up: FU). Results Thirty‐four participants enrolled in the study and received MCT (schizophrenia = 22, non‐schizophrenia = 12). Intent‐to‐treat analyses revealed significant improvements in quality of life/global functioning during the intervention period, and further improvements were observed during the follow‐up (all p