Table 5.

Longitudinal Assessment of Infant Serum PTH and ALP by Vitamin D Status

Measurement	Age	n	Vitamin D Status						Omnibus p-value
			Severely Deficient (< 25 nmol/L)		Deficient (25 –<50 nmol/L)		Sufficient (≥ 50 nmol/L)
			n	Value	n	Value	n	Value
PTH (pg/mL)	4 Weeks	87	16	21.3 ± 1.9	51	17.1 ± 1.1	20	18.5 ± 1.7	0.04
	26 Weeks	76	9	22.9 ± 2.5A	14	16.7 ± 2.0AB	53	13.6 ± 1.0B
	52 Weeks	80	3	25.3 ± 4.3	7	23.0 ± 2.8	70	14.1 ± 0.9
ALP (IU/L)	4 Weeks	66	12	223 ± 44	38	279 ± 24	16	199 ± 38	0.78
	26 Weeks	72	9	115 ± 50	12	180 ± 42	51	140 ± 21
	52 Weeks	76	3	166 ± 87	7	167 ± 57	66	184 ± 18

Least square means ± standard errors are reported. Mean differences were tested using repeated measures ANOVA, and pairwise p-values were calculated using the Tukey-Kramer adjustment for multiple comparisons. Means in a row with different superscript letters are significantly different.