Objective To demonstrate the interaction effect of outdoor physical activity and extra-curricular cultural classes before primary school on poor vision of primary and middle school students, so as to provide scientific basis for formulating strategies and measures to prevent and control poor vision of primary and secondary school students. Methods A stratified cluster random sampling method was used for cross-sectional study from September to November 2018. A total of 8 467 students from fourth grade to senior three grade in Hunan Province completed the physical examination and questionnaire survey.Multivariate Logistic regression was used to explore the interactive effect of outdoor physical activity and extra-curricular cultural class before primary school on poor vision, also relative excess risk of interaction (RERI), attributable proportion of interaction (API), interaction index S (Index S) were calculated to demonstrate the interaction. Results Among the 8 467 subjects, 5 612(66.28%) children had poor vision. Compared with those who did not attend extra-curricular cultural classes, those who attended had a significantly higher risk of poor vision (OR=1.500, 95%CI:1.331—1.689, P<0.001). Compared with those whose outdoor physical activity ≥ 2 h/day, those whose outdoor physical activity < 2 h/day had a significantly higher risk of poor vision (OR=1.247, 95%CI:1.103—1.409, P<0.001). There was a significant interaction between outdoor physical activity and extra-curricular cultural classes before primary school on poor vision (Pinteraction=0.003). With the potential covariates adjusted, the values of indicators (RERI, API, Index S) for interaction between outdoor physical activity and taking extra-curricular cultural classes before school age were 0.529, 0.310 and 3.973, respectively. Conclusions Both outdoor physical activities and extra-curricular cultural classes before primary school are associated with poor vision. In addition, they have an interactive effect on poor vision. Therefore, it is supposed to do more outdoor activities for preschoolchildren thereby reducing the prevalence of poor vision.
Key words
poor vision /
outdoor activities /
extra-curricular cultural courses /
interaction
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