Effects of a School-Based Trauma-Informed Psychosocial Competence Intervention on Nonsuicidal Self-Injury in Adolescents

The purpose of this randomized controlled trial is to evaluate whether a school-based Trauma-Informed Psychosocial Competence (TIPC) intervention can reduce nonsuicidal self-injury among adolescents in China. Nonsuicidal self-injury means deliberately injuring oneself without intending to die. The TIPC program aims to help adolescents understand and accept themselves, manage difficult emotions, cope with stress, communicate with others, and seek support. It uses a trauma-informed approach that recognizes how stressful or adverse experiences may affect young people and emphasizes safety, respect, and supportive relationships. The main question is whether adolescents receiving the TIPC program show a greater reduction in nonsuicidal self-injury than those in the comparison group. The study will also examine changes in emotional well-being and psychosocial functioning. Participants will be assigned to an intervention group or a comparison group through random allocation. Adolescents in the intervention group will take part in structured school-based sessions. Participants in both groups will complete questionnaires before and after the intervention to assess self-injury and related psychological and social outcomes.