Follow-up study of the association between bedroom light at night exposure and body mass index in children
Objective To explore the association between bedroom light at night(LAN)exposure and body mass index(BMI)in children at 1-year follow-up,so as to provide new strategies for obesity prevention.Methods From December 2021 to May 2022,cluster random sampling was conducted,involving 648 children from two primary schools in Tianchang,Chuzhou City,An-hui Province,China,to assess bedroom LAN exposure of children during sleep.A questionnaire survey and physical examination were carried out in May 2022.Multivariate linear regression was performed to analyze the correlation between bedroom LAN expo-sure and BMI variable quantity at 1-year follow-up(May,2023).Results The median intensity of bedroom LAN exposure during the sleep episode was[1.11(0.35,3.24)lx]in children.The proportion of the sample exposed to an average light intensity of ≥3 lx was 27.5％,while 19.0％was exposed to a LAN intensity of ≥5 lx during the sleep episode.In the multivariable linear regression,after adjusting for covariates,including sex,baseline age,sleep duration,family monthly income,and maternal education level,exposure to a 1 h-average post-bedtime LAN intensity of ≥3 lx(β=0.25,95％CI=0.05-0.44)and LAN≥5 lx(β=0.34,95％CI=0.12-0.55)was associated with a gain of 0.25 and 0.34 kg/m2,respectively,in the children,s BMI at the 1-year follow-up(P＜0.05).Conclusions A positive correlation was found between bedroom LAN exposure and BMI variable quantity at 1-year fol-low-up in children.Thus,reduced bedroom LAN exposure might be useful for interventions aimed at obesity prevention.
SleepLightEnvironmental exposureBody mass indexRegression analysisChild
NETL
NSTL
万方数据
