Prevalence and correlates of nonsuicidal self-injury among youths in Singapore: findings from the National Youth Mental Health Study

BackgroundNonsuicidal self-injury (NSSI) is a common phenomenon; a recent meta-analysis of studies conducted among non-clinical adolescents reported a global lifetime prevalence rate of 22.0%. NSSI results in significant impairment and is associated with negative outcomes later in young adulthood. There is, however, a dearth of research on the occurrence of NSSI in Singapore's youth population. Past studies examining NSSI behaviours among youths in Singapore were conducted using clinical samples, which tend to report a higher prevalence compared to community samples. The present study aims to establish the prevalence of NSSI and examine its associated sociodemographic and psychosocial correlates in the general youth population.MethodsThis study included 2600 youths aged 15-35 years who participated in the National Youth Mental Health Study, a nationwide cross-sectional survey of the mental health status of youths in Singapore. The Deliberate Self-Harm Inventory and Depression Anxiety Stress Scales Short Form were used to assess NSSI behaviours and mental health symptoms. Data on coping strategies, perceived social support and resilience were also collected.ResultsThe lifetime prevalence of NSSI among youths in Singapore was 25.0%, and the 12-month prevalence was found to be 6.8%. The median age of onset for lifetime NSSI was 14 years. Significantly higher odds of lifetime NSSI were observed among youths aged 15-29 years, females, and youths with lower educational attainment. Youths with severe and extremely severe symptoms of depression and anxiety and those with greater use of avoidance coping strategy were associated with higher odds of lifetime NSSI. Higher resilience scores were associated with lower odds of lifetime NSSI.Conclusion1 in 4 youths in Singapore had engaged in self-injurious behaviour at least once in their lifetime. Screening and early intervention programs could be targeted at the more vulnerable youth groups such as those in early- and mid- adolescence. Potential areas for future research and interventions could include resilience building and educating youths on adaptive coping strategies. The limitations of the cross-sectional study design and the use of self-reported data should be considered when interpreting the study findings.