Exploring the Major Factors Affecting Generalized Anxiety Disorder in Korean Adolescents: Based on the 2021 Korea Youth Health Behavior Survey

(1) Background: Recently, the prevalence of generalized anxiety disorder (GAD) among adolescents has been higher than in adults. Early detection is important for treatment. Accordingly, although various factors affecting adolescents’ GAD have been studied, the body of research is fragmented, and an integrated analysis of the influencing factors is needed. Therefore, in this study, we intended to analyze various factors affecting GAD. (2) Methods: Using data from the Korea Youth Health Behavior Survey (2021), sociodemographic factors, negative emotion, and physical activity factors were selected. Correlation analysis, t-test, ANOVA, and multiple regression analysis were performed using SPSS 26.0. (3) Results: Perceived stress was found to be the factor that had the greatest influence on GAD. (4) Conclusions: The risk of GAD in Korean adolescents was found to increase in female students who had higher levels of perceived stress, and participated in less high-intensity or muscle-strengthening exercise.