Teaching environmental health in primary and secondary schools in Shanghai and its association with screening myopia applying multilevel models / 中国学校卫生

ABSTRACT

Objective@#To understand the status of teaching environmental health in primary and secondary schools and explore its association with myopia, so as to provide a basis for precision myopia prevention and control.@*Methods@#From September to October 2020, a stratified cluster sampling method was used in 16 districts of Shanghai. After matching the teaching environment testing classrooms with the classrooms where the students were surveyed, totally 470 classrooms and 14 624 students were monitored. Trained professional technicians used laser range finder, luxmeter to measure parameters about teaching environmental health. Students were subject vision testing and questionnaires. Multilevel models was used to analyze the association between teaching environment and screening myopia.@*Results@#The qualified rates of each indicators of teaching environmental health were as follows window to floor area ratio (93.0%), classroom area per capita (82.1%), uniformity ratio of illuminance of blackboard ( 79.7% ), blackboard size (68.7%), daylight factor (67.0%), blackboard hanging height (66.9%), average illuminance on desk (66.4%), uniformity ratio of illuminance of desk (63.6%), reflectance of blackboard (46.8%), average illuminance on blackboard (41.4%), reflectance of wall (33.2%), desk and chair allocation compliance rate (19.8%). The results of two level Logistic model analysis showed that unqualified average illuminance on blackboard was positively associated with screening myopia ( OR =1.24, 95% CI = 1.05 -1.47, P <0.05).@*Conclusion@#Teaching environmental health of primary and secondary schools in Shanghai is not optimistic, teaching environment especially the desk and chair allocation compliance rate need to be improved. The average illumination on blackboard is positively correlated with screening myopia, suggesting that myopia prevention and control can focus on improving the illuminance on blackboard.