Effects of Depression and Peer Attachment on Smartphone Overdependence in Late Childhood Elementary School Students: A Cross-Sectional Study

Purpose: This study investigated how depression and peer attachment influence smartphone overdependence in elementary school students. Methods: The participants included 279 students in grades 4-6 with a mean age of 11.2 years (SD=0.8, range=10~12 years). Data were collected from December 24 to 31, 2024, and analyzed using descriptive statistics, independent t-tests, one-way ANOVA, Pearson's correlation coefficient, and multiple regression analysis. Results: All subdomains of depression were found to have positive correlations with smartphone overdependence: behavioral problems (r=.26), physiological symptoms (r=.24), self-deprecation (r=.22), loss of interest (r=.20), and depressive affect (r=.12). Conversely, smartphone overdependence showed negative associations with peer attachment subdomains: communication (r=-.25), trust (r=-.23), and alienation (r=-.19). In multiple regression analysis, peer communication (β=-.20) and depressive behavioral problems (β=.19) emerged as significant predictors of smartphone overdependence. Conclusion: The findings indicate that depressive behavioral problems and peer communication are linked to smartphone overdependence in late childhood, highlighting the importance of programs aimed at reducing behavioral issues and enhancing peer communication to encourage healthier smartphone usage.