Internet-based cognitive Behavioral therapy (ICBT) integrates the Internet and cognitive behavioral therapy, which enables patients to participate in different treatment modules online. ICBT has been proved to be an effective way to improve the symptoms of OCD patients with lower cost.~In the study, the investigators plan to develop an intervention pattern of stepped care in Internet-Based cognitive behavioral therapy (SC-ICBT): After individualized assessment（0 week and 3 week separately）, OCD patients will be provided with self-guided ICBT or therapist-guided ICBT through the severity of their symptoms flexibly. This study will be a randomized, controlled, assessor-blinded trial of three groups in the obsessive-compulsive disorder: Stepped Care in Internet-based Cognitive Behavioral Therapy (SC-ICBT) combined with medication, Cognitive Behavioral Group Therapy (CBGT) combined with medication, and conventional medical treatment (TAU). The study aims to investigate the efficacy and cost-effectiveness of SC-ICBT related to CBGT and TAU for adults with OCD in China.~The investigators plan to recruit 114 OCD patients and randomly assigns them to the SC-ICBT group, CBGT group, and TAU group for treatment of 6 weeks and follow-up of 3 months in the study. Questionnaires, scales, behavior experiments and other experimental materials will be used to evaluate the intervention effect of 6-week SC-ICBT on obsessive and compulsive symptoms, cognitive function and quality of life of OCD patients as well as patients' and therapists' cost.
This study aims to investigate the efficacy and cost-effectiveness of SC-ICBT related to CBGT and TAU for adults with OCD in China.