目的 分析儿童期视屏时间与左心室肥厚(LVH)的关系,为预防LVH等靶器官损害提供基础数据。方法 2017年11月-2018年1月采用方便整群抽样的方法,选取淄博市桓台县城南学校1 319名6~11岁儿童作为研究对象,进行问卷调查、身体测量和超声检测。LVH定义为左心室质量指数(LVMI)超过本人群的性别和年龄别的第90百分位数(P90)。采用多元Logistic 回归模型分析视屏时间对儿童LVH的影响。结果 所有儿童学习日、休息日和平均每月视屏时间分别为(0.42±0.65)h、(1.83±1.32)h 和(0.83±0.71)h,超过2 h/d的学生比例分别为0.6%(8/1 319)、23.4%(308/1 319)和4.6%(61/1 319)。多元Logistic 回归模型分析发现,控制性别、年龄、蔬菜水果、碳酸饮料、体力活动、睡眠时间和血压等协变量后,与平均每日视屏时间≤2 h/d相比,平均每日视屏时间>2 h/d的学生罹患LVH的风险增加(OR=2.16,95%CI=1.08~4.32,P＝0.03)。进一步控制体重指数(BMI)后,平均每日视屏时间>2 h/d的学生LVH的罹患风险的统计学意义消失(OR=1.45,95%CI=0.63~3.33,P=0.388)。而学习日和休息日视屏时间>2 h/d的学生罹患LVH风险,与视屏时间≤2 h/d的学生相比,差异无统计学意义(P>0.05)。结论 每天视屏时间过长是儿童LVH的重要危险因素,而BMI可能在视屏时间与LVH关系中起着中介效应。
Abstract
Objective To examine the association between screen time and left ventricular hypertrophy (LVH) among children,so as to provide evidence for the prevention of LVH. Methods A convenience cluster sampling method was adopted from Nov.2017 to Jan. 2018,and totally 1 319 students aged 6-11 years from an elementary school in Huantai county,Zibo city were recruited.The participants filled out questionnaires,conducted anthropometric and ultrasonography test.LVH was defined as left ventricular mass index (LVMI) ≥90th (P90) percentile values by age and sex of the present population.Multiple Logistic regression model was used to examine the association between screen time and LVH in children. Results The average screen time for weekdays,weekend days and all days were (0.42±0.65)h/d,(1.83±1.32)h/d and (0.83±0.71)h/d,respectively.The proportions of children with average screen time over 2 h/d for weekdays,weekend days and all days were 0.6% (8/1 319),23.4% (308/1 319) and 4.6%(61/1 319),respectively.Logistic regression analysis showed that after controlling sex,age,consumption of vegetables and fruits,and carbonated drinks,physical activity,sleep duration and blood pressure,compared with children with screen time less than 2 h/d,those with screen time over 2 h/d had increased risk of LVH (OR=2.16,95%CI:1.08-4.32,P=0.03).After additional adjustment for body mass index (BMI),the significant association disappeared (OR=1.45,95%CI:0.63-3.33,P=0.388).However,there were no significant differences on the association between screen time on weekdays and weekend days and risk of LVH (P>0.05). Conclusion Screen time over 2 h/d is associated with increased risk of LVH in childhood,and BMI may play a mediating effect on the association between screen time and LVH risk.
关键词
视屏时间 /
左心室肥厚 /
体重指数 /
儿童期
Key words
screentime /
leftventricularhypertrophy /
bodymassindex /
childhood
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基金
国家自然科学基金面上项目(81673195)
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