Online social activity time predicts ADHD problems in youth from late childhood to early adolescence in the ABCD study.

Online social interactions increase into adolescence. Although cross-sectional studies have positively associated online social activity (OSA) time and attention-deficit/hyperactivity disorder (ADHD) problems, the directionality remains unclear. Therefore, we examined longitudinal associations between OSA time and ADHD problems using data from the Adolescent Brain Cognitive Development (ABCD) study. Four waves of ABCD data from 11,819 youth participants (52.1% boys; Baseline: M_age = 9.92 years, SD_age = 0.62) were utilized. Random-intercepts cross-lagged panel models (RI-CLPMs) adjusting for potential confounds were employed to estimate longitudinal bidirectional associations. Multiple-group RI-CLPM analyses examined potential moderation effects of OSA content type and child's sex. The results revealed that greater OSA time was associated with more ADHD problems in early adolescence, while more ADHD problems did not predict greater OSA time. In moderation analyses, the cross-lagged effects of OSA time on ADHD problems were only significant for girls, and boys showed an inverse relation between ADHD problems and subsequent OSA time. No moderation effect of OSA content type was observed. These findings highlight the potential detrimental effect of OSA time on the development of attentional processes, especially for girls, thereby offering insights that could guide the development and targeting of interventions to mitigate future risks for ADHD problems during adolescence.