Table 4.
Sex specific multilevel regression models for bone mineral content at the (a) Whole Body, (b) Total Proximal Femur, (c) Femoral Neck and (d) Lumbar Spine in females
| Variables | (a) Whole Body | (b) Total Proximal Femur | (c) Femoral Neck | (d) Lumbar Spine | ||||
|---|---|---|---|---|---|---|---|---|
| Fixed Effect | Estimates | Estimates | Estimates | Estimates | ||||
| Constant | ||||||||
| Agec | −230.68(22.59) | −2.45(0.52) | −0.45(0.07) | −11.55(1.03) | ||||
| Agec2 | −1.48(0.58) | −0.04(0.01) | −0.005(0.002) | −0.07(0.03) | ||||
| Agec3 | −0.78(0.08) | −0.002(0.002) | 0.0008(0.0003) | −0.02(0.004) | ||||
| Height | 5.17(0.13) | 0.12(0.003) | 0.02(0.0004) | 0.20(0.006) | ||||
| Weight | 55.38(1.50) | 1.03(0.04) | 0.08(0.005) | 2.15(0.07) | ||||
| Agec*Height | 2.09(0.15) | 0.03(0.004) | 0.004(0.0004) | 0.10(0.01) | ||||
| Agec*Weight | −0.73(0.10) | −0.02(0.002) | −0.002(0.0003) | −0.03(0.005) | ||||
| Weight by Height | −62.48(2.47) | −1.40(0.064) | −0.09(0.008) | −3.08(0.11) | ||||
| White vs Asian | −20.74(9.97) | −1.22(0.20) | −0.2(0.03) | NS | ||||
| White vs Hispanic | NS | 1.84(0.55) | 0.34(0.07) | NS | ||||
| White vs Black | 182.96(21.79) | 2.31(0.44) | 0.39(0.06) | NS | ||||
| Random Effects | Level 1 | Level 1 | Level 1 | Level 1 | ||||
| Constant | 2618.82(90.95) | 1.41(0.06) | 0.025(0.001) | 3.55(0.15) | ||||
| Level 2 | Level 2 | Level 2 | Level 2 | |||||
| Constant | Agec | Constant | Agec | Constant | Agec | Constant | Agec | |
| Constant | 23531.90(1200.26) | 2527.44(210.47) | 0.28(0.03) | 1.40(0.11) | 0.16(0.01) | 0.02(0.002) | 38.73(2.20) | 5.64(0.45) |
| Agec | 2527.44(210.47) | 622.26(53.83) | 1.40(0.11) | 10.20(0.57) | 0.02(0.002) | 0.004(0.005) | 5.64(0.45) | 1.28(0.12) |
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.