Table 4.

Regression Models With Baseline 1,25(OH)₂D as Outcome

	Coefficient	SE	P
Change in subtotal BMC (0–12 mo), g	0.40	0.09	<.001
Baseline subtotal BMCa	−0.007	0.053	.90
25(OH)Da	0.23	0.19	.22
Constant	0.32	1.15	.78
Change in cortical BMC (0–12 mo), mg	0.24	0.10	.02
Baseline cortical BMCa	−0.043	0.071	.55
25(OH)Da	0.22	0.20	.27
Constant	1.99	1.06	.06
Change in height (0–12 mo), cm	0.030	0.009	<.001
Baseline heighta	0.25	0.20	.23
25(OH)Da	0.11	0.19	.54
Constant	4.24	1.23	<.001
Baseline BSAP, μg/La	0.41	0.01	<.001
25(OH)Da	0.386	0.17	.024
Constant	−0.07	0.87	.94

Greater bone accrual velocity, height velocity, and BSAP levels are associated with significantly higher 1,25(OH)₂D levels as an outcome. All models were adjusted for serum 25(OH)D levels. The models for bone accrual and growth velocity were adjusted for the baseline values. P values <.05 are shown in bold.

^aNatural log-transformed.