|  | BMI percentiles | Rohrer index | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Item | Â | Â | Normal | Obese | Â | Â | Normal | Obese | Â | ||||
Age, mean (SE) | Â | Â | 9.04 | (0.023) | 9.21 | (0.063) | Â | Â | 8.76 | (0.023) | 8.99 | (0.069) | Â |
 |  | N | n | % | N | % | P-valuea | N | N | % | N | % | P-valuea |
Gender | Boys | 3346 | 2882 | 86.1 | 464 | 13.9 | < 0.001 | 2582 | 2160 | 83.7 | 422 | 16.3 | < 0.001 |
Girls | 2988 | 2744 | 91.8 | 244 | 8.2 | Â | 2101 | 1886 | 89.8 | 215 | 10.2 | Â | |
School year | 1 | 1235 | 1126 | 91.2 | 109 | 8.8 | 0.021 | 1136 | 996 | 87.7 | 140 | 12.3 | 0.021 |
2 | 1161 | 1039 | 89.5 | 122 | 10.5 | Â | 945 | 833 | 88.1 | 112 | 11.9 | Â | |
3 | 1106 | 978 | 88.4 | 128 | 11.6 | Â | 813 | 708 | 87.1 | 105 | 12.9 | Â | |
4 | 1080 | 949 | 87.9 | 131 | 12.1 | Â | 730 | 626 | 85.8 | 104 | 14.2 | Â | |
5 | 989 | 857 | 86.7 | 132 | 13.3 | Â | 617 | 511 | 82.8 | 106 | 17.2 | Â | |
6 | 763 | 677 | 88.7 | 86 | 11.3 | Â | 442 | 372 | 84.2 | 70 | 15.8 | Â |