Table 1.
Descriptive participant characteristics (Mean ± SD) for Dutch adolescent boys and girls separately.
| 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 | |
* = significantly different between boys and girls. P < 0.002
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.