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.