西安市城区中学生静态活动与超重肥胖现状

Study of situation of sedentary activity and its association with overweight and obesity in secondary school students of urban area in Xi'an city

【目的】了解西安市城区中学生静态活动现状，并探讨其与超重肥胖的关系。【方法】通过多阶段整群抽样法调查西安市三城区三所完全中学737名学生，测量身高、体重并计算体质指数，采用“2000年中国学生体质与健康调研报告结果”和中国肥胖问题工作组标准划分低体重、正常、超重、肥胖。在校日和周末每天的静态活动时间及睡眠时间由学生自己填写问卷获得，学生的出生日期、父母信息通过家长自填问卷采集。【结果】西安市中学生每天总静态活动时间为（5．7±2．7）h，睡眠时间为（8．4±0．9）h，而看电视、做作业时间分别为（2．1±1．5）h、（2．3±1．1）h。西安市中学生总超重肥胖率为12．6％（超重率8．8％，肥胖率3．8％）。经Logistic回归分析，并调整性别、年级、居住地、父母文化，发现看电视时间每增加1h，中学生超重肥胖的危险增加37%（OR=1．37，95％CI为1．00～1．88）。以BMI为因变量进行多重线性回归，控制混杂因素后发现看电视每增加1h，中学生BMI将增加0．07kg／m^2。【结论】看电视可能与西安市青少年超重肥胖相关。

[Objective] To assess the situation of sedentary activity and its association with the prevalence of obesity among middle school students in Xi＇an. [Methods] A total of 737 students were enrolled from three secondary schools in Xi＇an by multi-stage random cluster sampling method. Body mass index（BMI） was derived from measured height and weight. Underweight, normalweight, overweight and obesity were classified with BMI cut-off points from WGOC and 2000 report on the physical fitness and health surveillance of Chinese school students＇. Information about time spent on sedentary activity and sleeping was collected from students＇ self-administered questionnaire, while birthday and parents＇ information were reported by their parents. [Results] The total sedentary time was （5.7± 2.7） hour per day,among which （2.1± 1.5）h and （2.3 ± 1.1）h were spent on watching TV and doing homework respectively. The daily sleeping time was （8. 4±0. 9）h. Overall 12.6% of secondary school students were overweight or obese（overweight 8. 8%; obesity3. 8%）. In a logistic regression model, after adjusted for sex, grade, residence and parents＇ culture, odds ratios were 38% higher with each hour on watching TV per day （OR=1. 38,95%CI：1.01-1.89）. While in a multiple linear model, BMI added 0. 07 kg/m^2 after adjusted confounders. [Conclusion] Watching TV may be close associated with adolescents＇ overweight and obesity in Xi＇an.