Abstract: Objective To investigate the status of non‐suicidal self‐injury (NSSI) among adolescents with mental disorders in Shanghai, and explore its related influencing factors. Methods Adolescents with mental disorders admitted to Shanghai Mental Health Center from June 2019 to December 2021 were selected to evaluate the occurrence of NSSI in the past two years by referring to the Diagnostic and Statistical Manual of Mental Disorders. The basic information of the respondents was collected by using self‐made questionnaire, and the impulse status was evaluated by using the Barratt Impulse Scale (BIS-11). Adolescent Life Events Scale (ASLEC) was used to assess the frequency and intensity of stressful life events. The descriptive analysis method was used to analyze the occurrence of NSSI in adolescents with mental disorders, and univariate and multivariate analysis methods were used to analyze the influencing factors of NSSI. Results NSSI occurred in 657 of 1 683 adolescents with mental disorders, with an incidence rate of 39.03%. There were 262 males and 395 females, aged 13-20 years, with an average age of (14.63±3.09) years. The course of disease was 1-4 years, with an average course of disease of (2.87±1.21) years; 268 cases were sporadic NSSI, 389 cases were recurrent NSSI. The lower arm, wrist and hand were the main injury sites of NSSI patients (40.03% and 33.03% respectively). Multivariate Logistic regression analysis showed that the more serious the depression (OR=2.255), school violence (OR=2.289), mother's education level of junior college or above (OR=2.428), depressive disorder (OR=1.855), bidirectional disorder (OR=2.212), high impulsiveness total score (OR=1.401), poor interpersonal relationship (OR=1.398), and heavy pressure of study (OR=2.098) were all risk factors leading to NSSI in adolescents with mental disorders. Conclusions The incidence of NSSI is high in adolescents with mental disorders. Patients with severe depression, school violence, high education level of mothers, depressive disorder, bidirectional disorder, high impulsiveness total score, poor interpersonal relationship, and heavy pressure of study are more likely to have NSSI. Therefore, the attention of patients with the above characteristics should be raised and the corresponding intervention strategies should be formulated in time to avoid the occurrence of NSSI as much as possible.

Key words: Adolescent, Mental disorders, Non‐suicidal self‐injury, Influencing factor