北京市房山区中小学生视屏时间与超重肥胖的关系

目的了解1周、上学日、周六周日视屏时间与儿童青少年超重肥胖的关系,为改善中小学生超重肥胖现状提供参考。方法对北京市房山区中小学校按照分层整群抽样的方式分别抽取城市中学、城市小学、乡村中学、乡村小学各4所学校,对抽中学校的学生共2 670名进行身高、体重等体格测量并连续记录1周运动行为日记。分析不同时段视屏时间与中小学生超重肥胖的关系。结果北京市中小学生超重肥胖率为32.28%,上学日视屏时间超过3 h的学生仅占2.13%,但周六周日视屏时间超过3 h的学生升至16.10%。在控制混杂因素后,1周日均视屏时间>2~3 h组与>3 h组的学生发生超重肥胖的风险分别是≤2 h组的1.388和1.590倍,上学日日均视屏时间>2~3 h组与>3 h组的学生发生超重肥胖的风险分别是≤2 h组的1.553和1.775倍。未发现周六周日不同视屏时间组学生超重肥胖风险不同。结论 1周日均与上学日日均视屏时间>2 h是儿童青少年超重肥胖的危险因素。应关注学生在上学日和周六周日的视屏时间。

Association between screen time and overweight and obesity among middle and primary school students in Fangshan District of Beijing city

Objective To explore the association between screen time and overweight and obesity among children and adolescents in a week,on weekdays and weekends,and to provide a reference for improving overweight and obesity of primary and middle school students.Methods By the method of stratified cluster sampling,16 schools (4 urban middle schools,4 rural middle schools,4 urban primary schools,4 rural primary schools,respectively) located in Fangshan district were selected.Students were required to record their daily physical activity,height and weight for seven days.The association between screen time and their overweight and obesity during the whole week,weekday and weekend were analyzed.Results The prevalence of overweight and obesity among the participants was 32.28%,2.13% of students reported their screen time in weekday was over 3 hours.But in weekend,16.10% of students' screen time achieved more than 3 hours.Compared with students whose screen time was less than 2 hours,those with screen time in the whole week higher than 2 hours or 3 hours were at 1.388 or 1.590 times risk of being overweight and obesity,controlling for the available confounders.In the same way,those with screen time in weekday higher than 2 hours or 3hours were at 1.553 or 1.775 times risk of being overweight and obesity,controlling for the available confounders.But the similar association was not observed in the weekend.Conclusion Screen time more than 2 hours in weekday and the whole week is the risk factor for overweight and obesity among children and adolescents.The students' screen time between weekday and weekend are different which worth more attention.