Table 1 Participation rates and characteristics of the sample
| Â | Boys | Girls |
|---|---|---|
n (%) | 290 (58.6) | 205 (41.4) |
Participation rate (%) | 40.7 | 39.4 |
Age (years) | Â | Â |
   mean ± SE | 15.4 ± 0.03 | 15.4 ± 0.03 |
   range | 14.3 - 17.1 | 14.6 - 16.9 |
Height (cm) |  | 163.9 ± 0.55 |
   mean ± SE | 173.5 ± 0.32 | 163.7 |
   median | 173.7 | 148.0 - 178.9 |
   range | 153.0 - 192.0 |  |
Weight (kg) | Â | Â |
   mean ± SE | 66.3 ± 1.14 | 57.9 ± 1.03 |
   median | 64.0 | 56.8 |
   range | 38.7 - 139.4 | 32.1 - 105.8 |
BMI (kg/m 2 ) | Â | Â |
   mean ± SE | 21.9 ± 0.34 | 21.5 ± 0.32 |
   median | 21.1 | 20.8 |
   range | 15.3 - 41.4 | 14.0 - 37.5 |
BMI categories (%) | Â | Â |
   not overweight/obese | 72.4 | 80.5 |
   overweight | 21.0 | 15.1 |
   obese | 6.6 | 4.4 |
Waist circumference (cm) | Â | Â |
   mean ± SE | 71.9 ± 0.92 | 65.8 ± 0.91 |
   median | 69.8 | 64.7 |
   range | 54.1 - 109.1 | 48.9 - 101.8 |
Waist to Height Ratio (cm/cm) | Â | Â |
   mean ± SE | 0.41 ± 0.005 | 0.40 ± 0.005 |
   median | 0.40 | 0.39 |
   range | 0.33 - 0.64 | 0.32 - 0.63 |
Fat mass (kg) | Â | Â |
   mean ± SE | 14.3 ± 0.78 | 17.8 ± 0.80 |
   median | 11.6 | 15.9 |
   range | 4.0 - 88.4 | 4.8 - 66.8 |
FMI (kg/m 2 ) | Â | Â |
   mean ± SE | 4.7 ± 0.25 | 6.6 ± 0.29 |
   median | 3.8 | 5.7 |
   range | 1.5 - 26.2 | 2.1 - 25.9 |