TABLE 1.
Characteristics of pregnant adolescents at study entry and delivery1
| 200 IU/d | 2000 IU/d | |
|---|---|---|
| Maternal age, y | 17.5 ± 1.1 [39] | 17.3 ± 1.2 [39] |
| Gestational age at entry, wk | 17.0 ± 4.3 [39] | 18.4 ± 4.6 [39] |
| Pre-pregnancy BMI, kg/m2 | 24.1 ± 4.9 [39] | 25.8 ± 6.8 [37] |
| African American race, n (%) | 26 (66.7) | 20 (51.3) |
| Hispanic ethnicity, n (%) | 11 (28.2) | 11 (29.0) |
| Serum 25(OH)D at entry, ng/mL | 23.1 ± 9.1 [39] | 26.9 ± 9.1 [39] |
| <12 ng/mL, n (%) | 4 (10.3) | 1 (2.6) |
| 12 to <20 ng/mL, n (%) | 13 (33.3) | 9 (23.1) |
| 20 to <30 ng/mL, n (%) | 14 (35.9) | 14 (35.9) |
| ≥30 ng/mL, n (%) | 8 (20.5) | 15 (38.5) |
| Serum 25(OH)D at delivery, ng/mL | 23.5 ± 10.2 [30] | 30.5 ± 14.1 [32]* |
| <12 ng/mL, n (%) | 2 (6.7) | 5 (15.6) |
| 12 to <20 ng/mL, n (%) | 11 (36.7) | 3 (9.4)* |
| 20 to <30 ng/mL, n (%) | 10 (33.3) | 7 (21.9) |
| 30 to ≤50 ng/mL, n (%) | 6 (20.0) | 15 (46.9)* |
| >50 ng/mL, n (%) | 1 (3.3) | 2 (6.3) |
| Number of vitamin D supplements consumed2 | 65 (27, 107) [30] | 75 (0, 117) [32] |
| Fall–winter delivery, n (%) | 16 (53.3) | 14 (43.8) |
| Gestational weight gain, kg | 13.6 ± 4.5 [30] | 17.2 ± 6.4 [32]* |
| Baby birth weight, g | 3233 ± 368 [29] | 3351 ± 486 [31] |
| Low birth weight (<2500 g), n (%) | — | 2 (6.5) |
| Preeclampsia/pregnancy-induced hypertension, n (%) | 4 (13.3) | 2 (6.3) |
1Values are means ± SDs [n] unless otherwise indicated. *Different from 200 IU/d, P < 0.05. IU, International Units; 25(OH)D, 25-hydroxyvitamin D.
2Median (25th,75th percentiles) [n].