TABLE 1.
Characteristics of pregnant adolescents enrolled1
| Maternal characteristics | Value |
| Total subjects recruited (n) | 171 |
| Age at enrollment (y) | 17.1 ± 1.12 (170) |
| Racial group (%) | |
| African American3 | 66.7 (114) |
| White | 33.3 (57) |
| Ethnicity (%) | |
| Hispanic | 23.7 (39) |
| Non-Hispanic | 76.2 (125) |
| Parity ≥1 (%) | 8.2 (14/170) |
| Smoking at entry into study (%) | 10.0 (17/170) |
| Prepregnancy BMI (kg/m2) | 24.7 ± 5.5 (165) |
| Weight gain (kg) | 16.8 ± 0.7 (150) |
| Dietary calcium intake (mg/d)4 | 917 ± 416 (163) |
| Dietary vitamin D intake (IU/d)4 | 216 ± 135 (163) |
| Gestational age at delivery (wk) | 39.2 ± 2.9 (165) |
| Maternal 25(OH)D at delivery (nmol/L) | 54.7 ± 27.5 (168) |
| Maternal 1,25(OH)2D at delivery (pmol/L) | 276.1 ± 79.6 (96) |
| Maternal PTH at delivery (pmol/L) | 4.74 ± 3.09 (80) |
1
n in parentheses. PTH, parathyroid hormone; 1,25(OH)2D, 1,25-dihydroxyvitamin D; 25(OH)D, 25-hydroxyvitamin D.
2
Mean ± SD (all such values).
3
Two adolescents who self-identified as Native American were included in the African American cohort.
4
Mean intakes were calculated from the mean of all 24-h dietary recalls administered (≤3 for each participant).