Table 5.
Longitudinal assessment of infant serum PTH and ALP by vitamin D status
| Measurement | Age (weeks) | n | Vitamin D status | Omnibus P‐value | |||||
|---|---|---|---|---|---|---|---|---|---|
| Severely deficient (<25 nmol L−1) | Deficient (25–<50 nmol L−1) | Sufficient (≥50 nmol L−1) | |||||||
| n | Value | n | Value | n | Value | ||||
| PTH (pg mL−1) | 4 | 87 | 16 | 21.3 ± 1.9 | 51 | 17.1 ± 1.1 | 20 | 18.5 ± 1.7 | 0.04 |
| 26 | 76 | 9 | 22.9 ± 2.5A | 14 | 16.7 ± 2.0AB | 53 | 13.6 ± 1.0B | ||
| 52 | 80 | 3 | 25.3 ± 4.3 | 7 | 23.0 ± 2.8 | 70 | 14.1 ± 0.9 | ||
| ALP (IU L−1) | 4 | 66 | 12 | 223 ± 44 | 38 | 279 ± 24 | 16 | 199 ± 38 | 0.78 |
| 26 | 72 | 9 | 115 ± 50 | 12 | 180 ± 42 | 51 | 140 ± 21 | ||
| 52 | 76 | 3 | 166 ± 87 | 7 | 167 ± 57 | 66 | 184 ± 18 | ||
ALP, alkaline phosphatase; PTH, parathyroid hormone. Least square means ± standard errors are reported. Mean differences were tested using repeated measures analysis of variance, 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.