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.
Key words
screentime /
leftventricularhypertrophy /
bodymassindex /
childhood
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