Changes in Smartphone Usage among Adolescents and Associated Subjective Health Concerns: A Secondary Analysis of the Korea Youth Risk Behavior Survey.

Background: We evaluated changes in the smartphone use rate and time among Korean adolescents and their awareness of associated health problems.

Methods: This study was a secondary analysis of the Korea Youth Risk Behavior Survey (2020-2023) conducted by the Korean Disease Control and Prevention Agency. The total number of enrolled adolescents aged 12-18 years was 214,526.