Table 3.

Regression Models With Baseline PTH as Outcome

	Coefficient	SE	P
Change in subtotal BMC (0–12 mo), g	0.51	0.14	<.001
Baseline subtotal BMCa	0.15	0.07	.05
25(OH)Da	−1.18	0.27	<.001
Dietary Ca intakea	−0.24	0.11	.03
Constant	6.22	1.60	<.001
Change in cortical BMC (0–12 mo), mg	0.34	0.14	.02
Baseline cortical BMCa	0.23	0.10	.03
25(OH)Da	−1.35	0.28	<.001
Dietary Ca intakea	−0.23	0.12	.05
Constant	8.36	1.52	<.001
Change in height (0–12 mo), cm	0.029	0.012	.02
Baseline heighta	0.92	0.29	.002
25(OH)Da	−1.37	0.27	<.001
Dietary Ca intakea	−0.20	0.12	.09
Constant	15.19	1.98	<.001
Baseline BSAP, μg/La	0.43	0.15	.006
25(OH)Da	−0.74	0.27	.007
Dietary Ca intakea	−0.21	0.12	.07
Constant	6.06	1.39	<.001

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

^aNatural log of value used to produce normality.