【Abstract】Background Students in secondary vocational health school are at a high risk of depressive symptoms. Depressive symptoms are closely related to self-harm, addiction, etc. Peer victimization and social media addiction are important influencing factors of depression. Positive metal health can alleviate depressive symptoms. However, the relationship between the four factors in adolescent depression is unclear and needs further research. Objective To investigate the mediating effect of positive mental health and social media addiction in the relationship between peer victimization and depression, and to provide references for the prevention of adolescent depression. Methods Form October to December 2020, a cross-sectional survey was conducted among 7 307 students in a secondary vocational health school in Luzhou using cluster sampling method, using the Multidimensional Peer Victimization Scale (MPVS), Warwick-Edinburgh Mental Well-being Scale (WEMWBS), Bergen Social Media Addiction Scale (BSMAS), and Patient Health Questionnaire-9(PHQ-9). SPSS26.0 and Process4.0 were used for Spearman correlation analysis, and mediation effect test. Results A total of 7 044 valid questionnaires were collected. PHQ-9 score was positively correlated with BSMAS score and MPVS score (r=0.404, 0.506, P<0.01). WEMWBS score was negatively correlated with PHQ-9 score, BSMAS score and MPVS score (r=-0.587, -0.259, -0.358, P<0.01). BSMAS score was positively correlated with MPVS score(r=0.328, P<0.01). Positive mental health partially mediates between peer victimization and depressive symptoms (indirect effect values is 0.130, 95% CI:0.119~0.141, effect size is 30.81%). Social media addiction partially mediates between peer victimization and depressive symptoms (indirect effect values is 0.052, 95% CI:0.045~0.059, effect size is 12.32%). Positive mental health-social media addiction plays a chain mediate role between peer victimization and depressive symptoms (indirect effect values is 0.012, 95% CI:0.010~0.014, effect size is 2.84%). Conclusion Peer victimization can directly predict the occurrence of depression, and can also indirectly affect the occurrence of depression through the chain mediation of positive mental health and social media addiction. |