TABLE 3.
Differences in maternal hemoglobin concentrations at midgestation and at delivery as a function of maternal 25(OH)D status in pregnant adolescents1
| Serum 25(OH)D, nmol/L |
|||||||||
| <50 | ≥50 | P2 | <40 | ≥40 | P2 | <30 | ≥30 | P2 | |
| Midgestation | |||||||||
| n | 60 | 58 | 29 | 89 | 14 | 104 | |||
| Hemoglobin, g/dL | 11.0 ± 0.833 | 11.4 ± 0.92 | 0.01 | 10.9 ± 0.82 | 11.2 ± 0.91 | 0.11 | 10.9 ± 0.85 | 11.2 ± 0.90 | 0.31 |
| Anemic, % | 6.8 | 10.5 | 0.47 | 6.9 | 9.2 | 0.70 | 7.1 | 8.8 | 0.83 |
| Delivery | |||||||||
| n | 58 | 67 | 39 | 86 | 20 | 105 | |||
| Hemoglobin, g/dL | 11.1 ± 1.3 | 12.0 ± 1.1 | 0.0001 | 11.3 ± 1.2 | 11.7 ± 1.3 | 0.06 | 11.2 ± 1.2 | 11.7 ± 1.3 | 0.11 |
| Anemic, % | 22.8 | 6.1 | 0.006 | 18.4 | 11.8 | 0.33 | 10.0 | 14.6 | 0.58 |
1
Anemia was calculated with the use of race- and trimester-specific cutoffs as described in Methods. 25(OH)D, 25-hydroxyvitamin D.
2
Differences in hemoglobin concentration between subgroups of 25(OH)D status were assessed with the use of Student’s t test. Differences in anemia prevalence between subgroups of 25(OH)D status were calculated with the use of the chi-square test of independence.
3
Mean ± SD (all such values).