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目的探讨江苏省南京市居民每周看电视时间与肥胖发生风险的关系。方法2004年7月,选取南京市的3个城区和1个乡村的35岁～居民进行健康相关的横断面调查。对体质指数(BMI)<28的人群进行3年随访观察;采用多元线性回归和多因素Logistic回归方法,分析看电视时间(h/周)与罹患肥胖风险的关联。结果基线调查时,BMI<28共3936人;完成随访2837人,随访率为72.1%。肥胖发病率为2.7%;男女性发病率分别为2.1%和3.3%。经年龄调整后,与≤7h/周相比,看电视时间为7～14,>14h/周者罹患肥胖的风险(RR)分别增加1.353和3.061倍。调整年龄和其他协变量后,看电视时间7～14,>14h/周人群发生肥胖的风险仍高于≤7h/周者,调整RR值分别为2.357,95%CI=1.126～4.934;3.639,95%CI=1.761～7.517;进一步调整基线BMI、腰围和臀围,看电视较长人群罹患肥胖风险有所降低,但差异仍有统计学意义(P<0.01)。经多因素调整,3年间看电视时间每增加1h,男女性发生肥胖的风险分别增加2.3%和4.9%。结论看电视时间越长,罹患肥胖的危险性越大,减少静坐时间和增加体力活动可预防肥胖发生。
Objective To explore the relationship between the weekly television time and the risk of obesity in Nanjing, Jiangsu Province. Methods In July, 2004, health-related cross-sectional surveys were conducted in three urban districts of Nanjing and one 35-year-old resident of a village. A 3-year follow-up of population with a body mass index (BMI) <28 was performed. Multivariate linear regression and multivariate logistic regression analysis were used to analyze the association between watching television time (h / week) and the risk of developing obesity. Results During the baseline survey, there were 3936 BMIs <28; 2837 patients were followed up with a follow-up rate of 72.1%. The incidence of obesity was 2.7%; the incidence of males and females was 2.1% and 3.3% respectively. After age adjustment, watching TV time was 7-14 compared with ≤7h / week, and risk of obesity increased by 1.353 and 3.061 times respectively for> 14h / week. Adjusted for age and other covariates, watching TV time 7 ~ 14,> 14h / week risk of obesity in the crowd is still higher than ≤ 7h / week were adjusted RR values were 2.357, 95% CI = 1.126 ~ 4.934; 3.639, 95% CI = 1.761-7.517; further adjustment for baseline BMI, waist circumference, and hip circumference decreased the risk of obesity among the longer-watched TV population, but the difference remained statistically significant (P <0.01). After adjustment for many factors, the risk of obesity increased by 2.3% and 4.9% respectively for every 1h of watching TV time in 3 years. Conclusion The longer the TV, the greater the risk of obesity. The reduction of sitting time and increased physical activity can prevent the occurrence of obesity.