Abstract: Objective To understand the prevalence and influencing factors of screening myopia combined with overweight/obesity in children and adolescents from 2019 to 2021 in Xi'an City,and to provide a reference for the co-prevention of myopia and overweight/obesity. Methods Students from 12 schools monitored for common diseases in Xi'an from 2019 to 2021 were selected for this study,and stratified cluster sampling was carried out in grades 4 to 6 of primary school,junior high school,and senior high school. To describe the status quo of screening myopia combined with overweight/obesity,χ² test and multiple logistic regression were used to analyze the influencing factors of comorbidity. Results From 2019 to 2021,a total of 5 768 children and adolescents were included,including 1 877 （32.54%） in grades 4 to 6 of primary school,1 928 （33.43%） in junior high school,and 1 963 （34.03%） in senior high school. The co-incidence rates of screening myopia and overweight/obesity from 2019 to 2021 were 27.4% （985/3 601）,16.1% （168/1 041）,and 27.4% （308/1 126）,respectively,with a J-shaped curve. The 3-year total co-incidence rate was 25.3% （1 461/5 768）. The co-incidence rate was higher in urban area than in suburban county,higher in boys than in girls,and increased with phase of studying （all P<0.01）. Video time ≥2 h/d was a risk factor for screening myopia combined with overweight/obesity in grades 4 to 6 of primary school students （OR=2.111）. Outdoor activity time ≥2 h/d was a protective factor for screening myopia combined with overweight/obesity in grades 4 to 6 of primary school students and junior high school students （OR=0.531,0.544）. Conclusions Reducing video time and increasing outdoor time can reduce the incidence of screening myopia combined with overweight/obesity in children and adolescents.

Key words: Children and adolescents, Screening myopia, Obesity, Comorbidity, Influencing factor