目的 分析屏幕暴露对儿童青少年超重肥胖间的影响路径,为儿童青少年超重肥胖预防和行为干预提供依据。方法 采用整群随机抽样的方法,于2020年9—11月,抽取浙江省小学、初中、高中同班级的842名学生进行问卷调查。收集人口学特征指标、体质量指数(BMI)水平、体力活动、边吃边看频率及屏幕暴露等信息。采用方差分析和χ2检验比较BMI正常、超重和肥胖组间差异,中介效应分析可能存在的中介效应。结果 842名分析对象中超重和肥胖儿童青少年205例(24.4%)。平均周＞1h体力活动次数为(3.0±2.3)d,平均周屏幕暴露时长为(22.0±9.0)h。69.7%的儿童青少年有边吃边看的习惯。屏幕暴露对儿童青少年的BMI无直接效应(β=-0.002,P=0.179),但可以通过体力活动的中介效应增加超重肥胖的风险(β=-0.030,P=0.001;β=-0.016,P=0.003)。结论 屏幕暴露通过降低儿童青少年体力活动水平增加其超重的发生风险。
Abstract
Objective To analyze the mediating pathway of the effect of screen exposure on overweight and obesity among children and adolescents,in order to provide evidence for the prevention and behavioral intervention of overweight and obesity in this population. Methods A total of 842 students in the same class from primary,junior and senior high schools in Zhejiang Province were selected by cluster random sampling method from September to November 2020.Data on demographic characteristics,body mass index (BMI),physical activity,frequency of eating while watching screens,and screen exposure were collected via questionnaires.Analysis of variance and chi-square test were used to compare the differences among non-and overweight and obesity groups,and the possible mediating effects were clarified. Results Among the 842 participants,205 (24.4%) were detected with overweight or obesity.Time of weekly more than one-hour physical activity was (3.0±2.3) days,and the average weekly screen exposure duration was (22.0±9.0) hours.Approximately 69.7% of children and adolescents had the habit of eating while watching screens.Screen exposure had no direct effect on BMI (β=-0.002,P=0.179), but could increase the risk of overweight and obesity through the mediating effect of physical activity (β =-0.030,P=0.001;β =-0.016,P=0.003). Conclusion Screen exposure increases the risk of overweight among children and adolescents by reducing their level of physical activity.
关键词
屏幕暴露 /
超重肥胖 /
儿童 /
青少年
Key words
screen exposure /
overweight and obesity /
children /
adolescents
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