Demographic characteristics and serum 25-hydroxyvitamin-D concentrations
| Characteristics | All infants (n=120) | Infants born <28 weeks PMA (n=67) | Infants born between 28 and 32 weeks PMA (n=53) |
|---|---|---|---|
| n (%) male | 51 (43) | 27 (41) | 24 (45) |
| n (%) African–American | 46 (39) | 29 (43) | 17 (32) |
| PMA in weeks | 28.1 (1.2) | 26.4 (1.0) | 30.4 (0.8) |
| Birth weight in g | 1028.1 (236.8) | 831.5 (231.7) | 1276.6 (245.9) |
| Maternal 25(OH)D in nmol/L at delivery | 49.2 (19.2) | 44.0 (12.5) | 55.7 (22.7)* |
| n (%) mothers with 25(OH)D <50 nmol/L | 75 (63) | 45 (67) | 30 (57) |
| Infant 25(OH)D in nmol/L at birth | 46.3 (14.0) | 42.0 (9.8) | 51.8 (19.5)** |
| n (%) infants with 25(OH)D <50 nmol/L | 76 (64) | 47 (70) | 29 (55)** |
| 25(OH)D in nmol/L at 36 weeks PMA or at discharge | 64 (21.8) | 59.2 (20.5) | 71 (23.5)*** |
| n (%) infants with 25(OH)D <50 nmol/L at 36 weeks PMA or at discharge | 43 (36) | 27 (40) | 16 (30) |
*p=0.02 for difference between 25(OH)D serum concentrations in mothers that delivered at<28 weeks vs 28–32 weeks PMA.
**p=0.02 for difference between infants born at <28 weeks vs 28–32 weeks PMA.
***p=0.04 for difference between infants born at 28 weeks vs <28–32 weeks PMA.
Values are mean (SD).
PMA, postmenstrual age.