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Table 1 Descriptive participant characteristics (Mean ± SD) for Dutch adolescent boys and girls separately.

From: Direction of the association between body fatness and self-reported screen time in Dutch adolescents

   T0 T1 T2 T3
Boys      
  Age, yrs 12.9 ± 0.5*    
  Ethnicity, %     
     Western 84.3    
     Non-Western 15.7    
  Height, cm 159.7 ± 8.2 163.0 ± 8.6)* 166.4 ± 8.7* 170.8 ± 8.5*
  Weight, kg 49.0 ± 10.1 52.0 ± 10.6) 55.2 ± 11.1 58.8 ± 10.8
  BMI, kg/m2 19.1 ± 2.9 19.5 ± 2.9) 19.8 ± 3.0 20.0 ± 2.7*
  Weight status, %     
     Healthy weight 78.9 81.7 80.1 84.0
     Overweight (obese) 19.4 ± 1.7 16.6 ± 1.) 16.7 ± 3.0 14.4 ± 1.7)
  WC, cm 68.1 ± 7.6 69.0 ± 7.2 69.7 ± 7.5 72.8 ± 8.1)*
  HC, cm 82.3 ± 7.4* 84.2 ± 7.6* 87.0 ± 7.5* 86.1 ± 7.0)*
  Skinfold thickness, mm 41.6 ± 20.7* 41.2 ± 21.8* 40.5 ± 21.9* 43.7 ± 22.0)*
  Shuttle run, laps 8.6 ± 2.1* 9.0 ± 2.2* 9.3 ± 2.3* 9.4 ± 2.4)*
  TV viewing, min/day 174.9 ± 97.6 141.6 ± 85.9 141.5 ± 76.8 148.4 ± 83.1)*
  Computer use, min/day 132.6 ± 85.1* 124.7 ± 88.2 132.7 ± 81.3 132.4 ± 89.0)
Girls      
  Age, yrs 12.7 ± 0.5)    
  Ethnicity, %     
     Western 89    
     Non-Western 11    
  Height, cm 158.8 ± 6.7 161.4 ± 6.4 163.3 ± 6.1 165.1 ± 5.9
  Weight, kg 49.4 ± 10.7 52.3 ± 11.0 54.2 ± 10.6 57.0 ± 10.8
  BMI, kg/m2 19.5 ± 3.4 20.0 ± 3.5 20.3 ± 3.4 20.9 ± 3.6
  Weight status, %     
     Healthy weight 78.2 81.6 80.1 79.8
     Overweight (obese) 17.5 (4.3) 15.5 (2.9) 16.8 (3.1) 16.2 (4.0)
  WC, cm 67.2 ± 8.0 68.9 ± 8.1 68.7 ± 8.0 70.4 ± 8.4
  HC, cm 85.3 ± 8.4 87.9 ± 9.0 89.8 ± 8.8 91.4 ± 8.3
  Skinfold thickness, mm 55.1 ± 27.1 56.0 ± 26.8 54.6 ± 22.4 68.7 ± 28.7
  Shuttle run, laps 7.2 ± 1.9 7.5 ± 1.8 7.6 ± 1.9 7.6 ± 2.0
  TV viewing, min/day 156.4 ± 95.3 134.8 ± 89.8 133.6 ± 73.9 123.5 ± 69.0
  Computer use, min/day 103.8 ± 78.3 119.7 ± 95.4 128.4 ± 88.6 126.0 ± 82.1
  1. * = significantly different between boys and girls. P < 0.002
  2. T0 = Baseline; T1 = 8 months after baseline; T2 = 12 months after baseline; T3 = 20 months after baseline; BMI = body mass index; WC = waist circumference; HC = hip circumference.