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Table 1 Selected characteristics of participants by school type in this study

From: Lifestyle-related behaviors and health-related quality of life among children and adolescents in China

Variables Overall (N = 4388) School type P valuea
Primary school (N = 1602) Junior high school (N = 1455) Senior high school (N = 1331)
Age      
 Mean (SDb) 13.9 (2.5) 11.2 (0.9) 14.1 (0.9) 16.9 (0.9)  
Gender (%)      
 Boys 50.2 53.9 50.9 45.1 < 0.001
 Girls 49.8 46.1 49.1 54.9  
Residence (%)      
 Rural 46.3 44.5 46.5 48.1 0.19
 Suburban 22.7 24.5 22.2 21.1  
 Urban 31.0 31.0 31.3 30.8  
Body weight status (%)c      
 Non-overweight 72.3 67.8 73.4 76.6 < 0.001
 Overweight 16.7 17.8 16.9 15.2  
 Obesity 11.0 14.4 9.7 8.2  
Physical activity (%)d      
 Sufficient 21.2 29.3 20.5 12.1 < 0.001
 Insufficient 78.8 70.7 79.5 87.9  
Screen time (%)      
 < 2 h/day 96.3 96.8 95.3 96.7 0.06
 ≥ 2 h/day 3.7 3.2 4.7 3.3  
Sleeping time (%)e      
 Sufficient 20.0 23.0 19.0 17.5 < 0.001
 Insufficient 80.0 77.0 81.0 82.5  
Sugar-sweetened beverage consumptionf      
 No 67.5 71.0 61.9 69.6 < 0.001
 Yes 32.5 29.0 38.1 30.4  
Fast food consumptionf      
 No 67.6 62.9 70.9 69.8 < 0.001
 Yes 32.4 37.1 29.1 30.2  
  1. aChi-square test
  2. bSD standard deviation
  3. cBody weight status was categorized based on age- and gender-specific recommendations for Chinese adolescents
  4. dSufficient physical activity refers to at least 60 min/day moderate-vigorous intensity physical activity plus ≥ 3 days/week muscle/bone-strengthening; while insufficient physical activity means less than 60 min/day moderate-vigorous intensity physical activity or having no ≥ 3 days/week muscle/bone-strengthening
  5. eSleeping time: sufficient sleeping time was defined as 10 h/day for children aged 7–13, 9 h/day for children aged 13–16, and 8 h/day for those aged 16–19, based on guidelines for promotion of children and adolescents’ physical activity and fitness by The State Council of China
  6. fFF and SSB consumption was classified as “no” or “yes” based on the separate consumption frequency