Yaling Zhao, Liang Wang, Hong Xue, Huijun Wang, Youfa Wang
Fast food consumption and its associations with obesity and hypertension among children: results from the baseline data of the Childhood Obesity Study in China Mega-cities
BMC public health
investigate characteristics screen time risk factors chinese primary middle school students april 2012 june 2012 according geographical distribution stratified random cluster sampling method used select 4 provinces eastern central western china respectively convenience sampling method used select 2 primary middle schools urban 2 primary middle schools rural province school grades included 2 classes selected grade total 51 866 students parents selected study participants 43 771 questionnaires valid information demographics academic performance screen time tv computer cellphone weekdays weekends prevalence high screen time compared multivariate logistic regression used analyze association screen time 2 hd potential influential factors percentage students screen time 2 hd weekdays weekends 162 7 08243 771 415 18 14143 771 26 28014 p0001 respectively distribution p50 p25p75 screen time weekdays weekends 090416 181030 z13126 p0001 respectively results multinomial logistic regression analysis showed weekdays subjects characterized primary school students boys urban area living western area sufficient vigorous physical activity 2 dw higher risk screen time 2 hd characterized elementary school students girls rural area living eastern area sufficient vigorous physical activity 3 dw odds ratio 201 154 121 109 107 respectively p005 subjects characterized normal worse self rating academic performance higher risk screen time 2 hd characterized good self rating academic performance odds ratioes 124 173 respectively p005 subjects characterized paternal education level elementary school middle school high school secondary school higher risk screen time 2 hd characterized paternal education level college school high odds ratioes 141 147 152 respectively p005 subjects characterized maternal education level elementary school middle school high school secondary school higher risk screen time 2 hd characterized maternal education level college odds ratioes 140 152 147 respectively p005 weekends subjects characterized primary school students boys urban area sufficient vigorous physical activity 2 dw higher risk screen time 2 hd characterized elementary school students girls rural area sufficient vigorous physical activity 3 dw odds ratioes 211 151 120 105 respectively p005 weekends subjects characterized normal worse self rating academic performance higher risk screen time 2 hd characterized good self rating academic performance odds ratioes 109 126 respectively p005 subjects characterized paternal education level elementary school middle school high school secondary school higher risk screen time 2 hd characterized paternal education level college school high odds ratioes 129 130 119 respectively p005 subjects characterized maternal education level elementary school middle school higher risk screen time 2 hd characterized maternal education level college school high odds ratioes 119 116 respectively p005 prevalence screen time 2 hd high screen time weekdays longer weekends significant differences among different sexes urban rural areas living areas self rating academic performance parents education levels physical activity groups