Comparison of Sleep Onset Time According to Grade, Outdoor Time, and Screen-Based Media Device Use Time in Children and Adolescents in One District of Daegu, Korea

Objective: The purpose of this study is to identify the sleep onset time (SOT), outing activities, and screen-based media device (SBMD) use by grade evaluate differences in SOT according activities SBMD use. Methods: A total 10,080 students from one district Daegu Metropolitan City completed Survey for Outing Time Usage Children, Adolescents, Parents, among which SOT, mobile phone usage behavior were analyzed. Results: There was a significant difference on weekdays weekends level. high school seniors 2 hours 20 minutes later than that elementary regardless weekends. activity time, game video-watching time. Conclusion: significantly delayed grade, who lot delayed. It possible students’ health deteriorates depending due various factors. considered personal, educational, socio-environmental efforts are needed improve health.