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Table 1 Selected characteristics of participants in this study

From: Association of academic performance, general health with health-related quality of life in primary and high school students in China

  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 0.192
 Suburban 22.7 24.5 22.2 21.1
 Urban 31.0 31.0 31.3 30.8
Self-rated academic performance (%)c
 Poor 20.6 16.5 25.1 20.7  
 Fair 34.6 30.9 32.1 41.7 < 0.001
 Good 44.8 52.6 42.8 37.6  
Self-assessed general health statusd
 Poor 3.9 2.7 3.5 5.6  
 Fair 35.7 25.7 36.0 47.3 < 0.001
 Good 60.5 71.5 60.5 47.1  
Body weight status (%)
 Non-overweight 72.3 67.8 73.4 76.6  
 Overweight 16.7 17.8 16.9 15.2 < 0.001
 Obesity 11.0 14.4 9.7 8.2  
Physical activity (%)e
 Sufficient 20.0 23.0 19.0 17.5 < 0.001
 Insufficient 80.0 77.0 81.0 82.5
Screen time (%)
 < 2 h/day 96.3 96.8 95.3 96.7 0.060
 ≥ 2 h/day 3.7 3.2 4.7 3.3
Parental educational attainment
 < 9 years 38.9 47.2 26.7 42.4  
 10–13 years 32.2 27.0 37.9 32.3 < 0.001
 ≥ 13 years 28.8 25.8 35.4 25.2  
  1. aChi-square test
  2. bSD: standard deviation
  3. cGood- excellent or good; Fair-not good and not poor; Poor- poor or very poor
  4. dGood- very good or good; Fair- not good or not bad; Poor-poor or very poor
  5. eSufficient 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