Objective:

To examine the integrated developmental pathways leading to non-suicidal self-injury (NSSI) and suicidality in adolescents and young adults, focusing on the interplay of childhood adversity, social support, internet use issues, and psychological vulnerability.

Approach:

• Participant Recruitment: Adolescents and young adults aged 13–29 years with a history of self-harm or suicidality will be recruited from National Taiwan University Hospital, alongside community participants without psychiatric diagnoses as controls.
• Data Collection: Participants will complete self-report and caregiver-report measures assessing various psychosocial and clinical characteristics.
• Data Analysis: Descriptive and group-comparison analyses will be conducted, with structural equation modeling used to examine associations between childhood adversity, support, internet use, psychological vulnerability, and NSSI/suicidality.

Key Findings:

• NSSI is increasingly recognized as a major mental health concern among adolescents and young adults.
• Multiple psychosocial and psychological factors are associated with NSSI and suicidality, but they are often studied in isolation.
• Childhood adversity, inadequate support, and problematic internet use may interact to influence psychological vulnerability and self-injurious behavior.

Interpretation:

Limitations:

• The study may be limited by its reliance on self-report measures, which can be subject to bias.
• The findings may not be generalizable beyond the Taiwanese context.

Conclusion: