Sex/age group | Equation | R2 | P |
---|---|---|---|
Boys | Â | Â | Â |
 7–9 yrs | Y=-20.370 × 2 + 14.182X + 45.111 | 0.013 | <0.01 |
 10–12 yrs | Y=-55.863 × 2 + 39.758X + 38.087 | 0.049 | <0.01 |
 13–15 yrs | Y=-95.291 × 2 + 74.329X + 29.728 | 0.019 | <0.01 |
 16–18 yrs | Y=-133.134 × 2 + 106.747X + 19.843 | 0.02 | <0.01 |
Girls | Â | Â | Â |
 7–9 yrs | Y=-16.084 × 2 + 10.859X + 45.394 | 0.006 | <0.01 |
 10–12 yrs | Y=-12.005 × 2 + 1.682X + 45.195 | 0.025 | <0.01 |
 13–15 yrs | Y=-36.634 × 2 + 26.081X + 35.986 | 0.004 | <0.01 |
 16–18 yrs | Y=-68.701 × 2 + 50.408X + 26.431 | 0.011 | <0.01 |
Total | Â | Â | Â |
 7–9 yrs | Y=-16.789 × 2 + 11.530X + 45.408 | 0.008 | <0.01 |
 10–12 yrs | Y=-34.146 × 2 + 21.717X + 41.270 | 0.028 | <0.01 |
 13–15 yrs | Y=-50.482 × 2 + 38.968X + 34.868 | 0.004 | <0.01 |
 16–18 yrs | Y=-66.035 × 2 + 54.740X + 26.835 | 0.003 | <0.01 |