Table 3.
Sex-specific multilevel regression models for bone mineral content of the (a) Whole Body, (b) Total Proximal Femur, (c) Femoral Neck and (d) Lumbar Spine in males
| Variables | (a) Whole Body | (b) Total Proximal Femur | (c) Femoral Neck | (d) Lumbar Spine | ||||
|---|---|---|---|---|---|---|---|---|
| Fixed Effect | Estimates | Estimates | Estimates | Estimates | ||||
| Constant | −1271.18(223.45) | −38.41(5.69) | −4.19(0.30) | −108.41(3.92) | ||||
| Agec | −554.33(38.65) | −10.56(0.94) | −0.98(0.10) | −33.73(1.36) | ||||
| Agec2 | −9.39(1.02) | −0.23(0.02) | −0.02(0.003) | −0.54(0.04) | ||||
| Agec3 | 0.44(0.12) | 0.003(0.003) | 0.00001(0.0004) | 0.04(0.005) | ||||
| Height | 14.28(1.46) | 0.37(0.04) | 0.05(0.002) | 0.90(0.03) | ||||
| Weight | 31.06(4.39) | 0.58(0.11) | 0.01(0.002) | 0.04(0.02) | ||||
| Agec*Height | 3.69(0.24) | 0.07(0.006) | 0.006(0.0006) | 0.21(0.008) | ||||
| Agec*Weight | NS | NS | 0.001(0.0005) | NS | ||||
| Weight by Height | −31.83(6.82) | −0.72(0.17) | NS | NS | ||||
| White vs Asian | −31.36(9.97) | −0.70(0.22) | −0.22(0.03) | NS | ||||
| White vs Hispanic | −75.49(28.21) | 1.57(0.65) | 0.29(0.09) | NS | ||||
| White vs Black | 82.81(26.26) | 4.20(0.58) | 0.63(0.08) | NS | ||||
| Random Effects | Level 1 | Level 1 | Level 1 | Level 1 | ||||
| Constant | 2640.6(132.36) | 2.90(0.14) | 0.03(0.001) | 2.84(0.17) | ||||
| Level 2 | Level 2 | Level 2 | Level 2 | |||||
| Constant | Agec | Constant | Agec | Constant | Agec | Constant | Agec | |
| Constant | 23594.47(1542.09) | 3938.13(370.75) | 14.320(0.95) | 2.656(0.23) | 0.206(0.01) | 0.03(0.002) | 39.29(2.97) | 9016(0.86) |
| Agec | 3938.13(370.75) | 1264.66(124.50) | 2.656(0.23) | 0.560(0.07) | 0.028(0.002) | 0.007(0.010) | 9.16(0.86) | 2.979(0.29) |
Fixed effect values are Estimated Mean Coefficients (SEE - Standard Error Estimate); Random effects values Estimated Mean Variance (SEE). Level 1 – within individuals; Level 2 – between individuals. Agec – Age centred (Age – 13 years); Agec2 – Age centred squared; Agec3 - Age centred cubed; Height (cm); Weight (kg); Agec*Height – Agec multiplied by height; Agec*Weight – Agec multiplied by weight; Weight by height − Weight/height*100; White vs Asian - White 0, Asian = 1; White vs Hispanic - White 0, Hispanic = 1; White vs Black - White 0, Black = 1; P< 0.05 (mean > 2*SEE). NS = not significant and removed from the model.