Table 1.
Clinical characteristics of the study population.
| Vit D ≥ 10 ng/mL (N = 791) | Vit D < 10 ng/mL (N = 288) | p-value | |
|---|---|---|---|
| Maternal age (y) | 34.9 ± 4.1 | 34.5 ± 4.1 | 0.088 |
| Height (cm) | 161.8 ± 5.3 | 161.3 ± 4.8 | 0.459 |
| BMI | |||
| BMI in pre-Pregnancy | 22.7 ± 4.0 | 22.9 ± 3.7 | 0.739 |
| BMI in term | 27.0 ± 3.9 | 27.0 ± 3.6 | 0.981 |
| Nulliparity | 567 (71.8) | 186 (64.6) | 0.023a |
| Prior preterm birth | 27 (3.4) | 13 (4.5) | 0.397 |
| Method of conception | 0.003a | ||
| Spontaneous | 217 (60.1) | 62 (77.5) | |
| Ovarian stimulation | 10 (2.8) | 2 (2.5) | |
| In vitro fertilization | 134 (37.1) | 16 (20.0) | |
Data are presented in mean ± SD or number of cases (percentage).
Vit D, vitamin D; BMI, body mass index; GA, gestational age.
a statistically significant difference (p < 0.05).