A meta-analysis on the relation between peer victimization and adolescent non-suicidal self-injury

Several studies suggest that there are relations between children's or adolescents' self-injurious behaviors and peer victimization. In the current study, a meta-analysis was performed to study the relations between non-suicidal self-injury and peer victimization. Non-suicidal self-injury focuses on self-injurious behaviors without suicidal intent, that result in immediate tissue damage and are not socially sanctioned within one's culture or for display. Using a meta-analysis, effect sizes of existing studies can be statistically summarized, and publication bias and moderators can be analyzed. The databases PsycINFO, MEDLINE, ERIC and ProQuest were searched for relevant articles. Articles were only included if they focused on children or adolescents, if they focused on non-clinical samples, and if they focused on self-injuring behaviors as opposed to thoughts or ideation. We found nine studies with fourteen independent samples and a total of 20,898 adolescents and children reporting on the relation between peer victimization and non-suicidal self-injury. Our analysis showed positive and significant relations between non-suicidal self-injury and peer victimization. Further analyses showed an absence of publication bias. Younger children that were victimized reported significantly more non-suicidal self-injury than older children. By preventing peer victimization we may potentially prevent non-suicidal self-injury in children and adolescents.