Metacognitive Therapy for Obsessive-Compulsive Disorder

The goal of this clinical trial is to learn if metacognitive therapy can be effective in a Chinese sample of obsessive compulsive disorder (OCD) . The main questions it aims to answer are: Can metacognitive therapy significantly reduce participants\' levels of obsessive-compulsive symptoms? Can metacognitive therapy significantly improve participants\' metacognitive adaptations? The researchers will compare metacognitive therapy to a control condition without psychotherapy to see if metacognitive therapy is effective in treating OCD. Participants will: Receive the metacognitive therapy intervention or under control conditions for 8 to 15 weeks. Be assessed for symptoms and metacognitive beliefs at pre-intervention, post-intervention and 12 weeks post-intervention