Associations Between Psychological Factors, Routine Hematological and Biochemical Indicators, and Non-Suicidal Self-Injury Among University Students: An Exploratory Cross-Sectional Study

Background: Non-suicidal self-injury (NSSI) is a major mental health concern among university students. Although psychological risk factors for NSSI have been extensively studied, the potential contribution of routinely available hematological and biochemical indicators remains unclear. This study examined their associations with NSSI and their incremental value beyond psychological factors. Methods: This cross-sectional study included 1,661 university students who completed campus psychological screening and routine health examinations. NSSI status was defined as an NSSI total score greater t