A Longitudinal Study on the Effectiveness of Dialectical Behavior Therapy Based on “Internet Plus” for Adolescent Non‐Suicidal Self‐Injury Intervention

OBJECTIVE: The aim of this study is to conduct a longitudinal evaluation of the effectiveness of Dialectical Behavior Therapy (DBT) based on the "Internet Plus" model on adolescents with Non-Suicidal Self-Injury (NSSI). METHODS: Seventy-four NSSI patients were randomly divided into an intervention group (36 cases) and a control group (38 cases). The intervention group underwent a 3-month "Internet Plus" DBT intervention, whereas the control group received standard psychological intervention. The Adolescent Non-suicidal Self-injury Assessment Questionnaire (ANSAQ), the Hamilton Depression Rating Scale (17 items, HAMD-17), and the Simplified Coping Style Questionnaire (SCSQ) were administered to assess NSSI behavior, depressive symptoms, and coping strategies at baseline and at 1, 2, and 3 months post-intervention. RESULTS: The intervention group demonstrated significant improvements in the frequency of self-injury, depressive symptoms, and coping strategies (p < 0.05), with notable differences compared to the control group. CONCLUSION: The "Internet Plus" DBT intervention model has a positive effect on improving the symptoms of adolescents with NSSI.