Background To establish an estimate of prevalence in a nationally representative sample of community adolescents. To examine associations between self-harm and wellbeing. Methods An anonymous self-report survey completed by 2000 adolescents aged 13–18 years across England. Wellbeing was measured using the Warwick–Edinburgh Mental Wellbeing Scale (WEMWBS). Results In total 15.5% (n = 309) of participants reported ever having self-harmed (95% confidence intervals 13.9–17.1).
