Analysis of influencing factors on forced vital capacity/weight index among Chinese students aged 7 to 18 in 2019
Objective To investigate the patterns of forced vital capacity/weight index(FWI)change among Han and minority ethnic students aged 7-18 across 31 provinces(municipalities,autonomous regions)in China in 2019.Methods A total of 212 632 Han Chinese students aged 7-18 and 89 763 minority ethnic students aged 7-18 were selected from the National Survey on Student Physical Fitness and Health in 2019.Group-based tra-jectory modeling was used to identify FWI trajectories and a circular heat map of FWI of Chinese Han and minor-ity students were drawn.Moreover,generalized additive models were used to further explore the relationship be-tween influencing factors of FWI,with height,per capita gross domestic product(GDP),urbanization rate,and PM2.5 taken as smoothing terms and independent variables,with adjustment for region,gender,and age.Results In 2019,the FWI level of Han students aged 7 to 18 increased with age,and the FWI values for Han and minority ethnic boys[(60.67±12.98)ml/kg,(58.10±12.91)ml/kg]were higher than girls[(49.22±11.34)ml/kg,(49.22±11.34)ml/kg].FWI of Han nationality students in 30 provinces(municipalities,autono-mous regions of China)showed four types of FWI variation patterns:significantly higher than the national average group(by 4.17 ml/kg),slightly higher than the national average group(by 1.00 ml/kg),slightly lower than the national average group(by 2.38 ml/kg),and significantly lower than the national average(by 5.17 ml/kg).FWI of students from economically developed areas generally had higher FWI than those from less developed north-west regions,with a maximum difference of 16.32 ml/kg.FWI trajectory of 26 minority students showed three situation patterns:slightly higher than the average level of Han nationality(by 2.75 ml/kg),slightly lower than the average level of Han nationality(by 2.82 ml/kg)and significantly lower than the average level of Han national-ity(by 8.26 ml/kg).FWI for students from 19 minority ethnic groups was slightly or significantly lower than the Han average group.Height,per capita gross domestic product,urbanization rate,and PM2.5 showed a non-linear relationship with FWI,with effective degrees of freedom(EDF)all＞1(P＜0.05),and height had the greatest impact(deviance explained=9.10％).Conclusions There were significant regional and ethnic differ-ences in FWI among Chinese students in 2019,which were jointly influenced by physiological,socio-economic,and environmental factors.Differentiated respiratory health promotion strategies,including air quality improve-ment,weight control,and physical activity,need to be developed according to socio-economic conditions in dif-ferent provinces.
Forced vital capacity/weight indexRegional differencesEthnic differencesCross-sectional study
NETL
NSTL
万方数据
