Table 4.

Regression coefficients (β) for baseline (Y0) bone Z-scores predicting bone Z-scores at yr 3 (Y3) with and without adjusting for height and weight Z-scores

Model	Males		Females
	β-Coefficient (se)a for BMD ZY0	Model R2	β-Coefficient (se)a for BMD ZY0	Model R2
Whole body BMC Z-score
Race, age, Tanner stage	0.831 (0.023)	0.71	0.849 (0.020)	0.76
+ Ht ZY0, Wt ZY0	0.765 (0.033)	0.71	0.820 (0.029)	0.76
+ Ht ZY0, Wt ZY0, ΔHt Z, ΔWt Z	0.835 (0.026)	0.83	0.851 (0.022)	0.86
Lumbar spine BMD Z-score
Race, age, Tanner stage	0.827 (0.023)	0.68	0.842 (0.020)	0.75
+ Ht ZY0, Wt ZY0	0.808 (0.025)	0.68	0.838 (0.022)	0.75
+ Ht ZY0, Wt ZY0, ΔHt Z, ΔWt Z	0.842 (0.024)	0.73	0.896 (0.020)	0.82
Total hip Z-score
Race, age, Tanner stage	0.864 (0.022)	0.72	0.875 (0.020)	0.75
+ Ht ZY0, Wt ZY0	0.855 (0.024)	0.72	0.878 (0.022)	0.75
+ Ht ZY0, Wt ZY0, ΔHt Z, ΔWt Z	0.884 (0.022)	0.78	0.900 (0.019)	0.82
Femoral neck Z-score
Race, age, Tanner stage	0.846 (0.022)	0.70	0.863 (0.021)	0.73
+ Ht ZY0, Wt ZY0	0.844 (0.024)	0.70	0.873 (0.024)	0.73
+ Ht ZY0, Wt ZY0, ΔHt Z, ΔWt Z	0.856 (0.023)	0.74	0.867 (0.022)	0.79
1/3 radius Z-score
Race, age, Tanner stage	0.776 (0.025)	0.63	0.826 (0.022)	0.71
+ Ht ZY0, Wt ZY0	0.760 (0.026)	0.63	0.823 (0.023)	0.71
+ Ht ZY0, Wt ZY0, ΔHt Z, ΔWt Z	0.804 (0.025)	0.67	0.844 (0.023)	0.73

^aAll P < 0.0001.