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| Correlation analysis of body activities and myopia among primary and middle school students |
| YANGDongling1, GUO Changyi1, ZHOU Yuefang1, YU Jin1, WANG Pengfei1, LU Xi1, ZOU Zhiyong2, LUO Chunyan1* |
| 1.Shanghai Municipal Center for Disease Control and Prevention, Shanghai 200336, China; 2.Institute of Child and Adolescent Health, School of Public Health, Peking University, Beijing 100191, China |
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Abstract Objective To explore the association between physical activity, sedentary behaviors, and myopia among primary and middle school students in Shanghai. Methods A total of 9 583 students were selected from 16 schools in 8 districts in Shanghai by stratified clustering sampling methods. Questionnaires were performed to get the information of physical activity and sedentary behaviors. Vision examinations were carried out. Univariate and multivariable methods were used to analyze the association between physical activity, sedentary behaviors and myopia respectively. Results Among primary and middle school students in Shanghai, the myopia prevalence rate was 47.2%. The average moderate and rigorous physical activity（MVPA） time, total sedentary time, homework time, watching TV time, playing computer/video game time was 0.57 h(0.25-1.14 h), 5.77 h(2.50-8.00 h), 2.00 h(1.50-3.00 h), 0.50 h(0.33-1.00 h), and 0.33 h(0.00-1.00 h) per day, respectively. In a logistic regression model, after adjusted for sex, age and parental myopia, odds ratios were 9.5% higher with each hour on homework per day (OR=1.095，95%CI=1.043-1.150). Contrarily, the odds ratio of MVPA up to 1 h was 0.823 (95%CI=0.735-0.921). Conclusion Longer homework time was the risk factor of myopia and MVPA up to 1 h was the protective factor among primary and middle school students in Shanghai. To prevent myopia, students should be encouraged to take more outdoor physical activity.
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