| Total | Boys | Girls | |||
---|---|---|---|---|---|---|
 | n | Mean± SD | n | Mean± SD | n | Mean± SD |
Age (years) | 79 | 8.6 ± 1.4 | 37 | 8.6 ± 1.3 | 42 | 8.5 ± 1.4 |
Body height (cm) | 78 | 137.5 ± 9.6 | 36 | 138.0 ± 9.3 | 42 | 137.0 ± 10.0 |
Body weight (kg) | 78 | 34.8 ± 10.3 | 36 | 34.8 ± 9.5 | 42 | 34.9 ± 10.9 |
 | n | % | n | % | n | % |
BMI category | Â | Â | Â | Â | Â | Â |
 Normal | 53 | 67.9 | 26 | 72.2 | 27 | 64.3 |
 Overweight | 25 | 32.1 | 10 | 17.8 | 15 | 35.7 |
City | Â | Â | Â | Â | Â | Â |
 Haarlem | 8 | 10.1 | 2 | 5.4 | 6 | 14.3 |
 Amersfoort | 30 | 38.0 | 16 | 43.2 | 14 | 33.3 |
 Hengelo | 24 | 30.4 | 12 | 32.4 | 12 | 28.6 |
 Vlaardingen | 8 | 10.1 | 4 | 10.8 | 4 | 9.5 |
 Rotterdam | 9 | 11.4 | 3 | 8.1 | 6 | 14.3 |