| Training cohort (n = 18) | Validation cohort (n = 10) | |
| Demographics | ||
| Age (years, mean ± SD) | 31.9 ± 3.4 | 32.8 ± 5.1 |
| Body mass index (kg/m2, mean ± SD) | 23.8 ± 6.5 | 26.3 ± 2.2 |
| Gravity [median (interquartile range)] | 1.5 (1, 7) | 2 (1, 5) |
| Parity (% nulliparous) | 50 | 30 |
| Race (%) | ||
| Caucasian | 15 (83) | 7 (70) |
| Others (Asian, African, or American Indian) | 2 (11) | 3 (30) |
| Unknown | 1 (6) | 0 |
| Ethnicity (% Hispanic) | 3 (11) | 2 (20) |
| Married (%) | 14 (78) | 8 (80) |
| Level of education (%) | ||
| ≤High school | 2 (11) | 1 (10) |
| >High school | 16 (89) | 9 (90) |
| Current pregnancy parameters | ||
| Gestational age at delivery (weeks, mean ± SD) | 38.9 ± 1.4 | 39.5 ± 1.3 |
| Mode of delivery (%) | ||
| Spontaneous | 13 (72) | 5 (50) |
| Cesarian section | 5 (18) | 5 (50) |
| Birth weight (kg, mean ± SD) | 3.2 ± 0.4 | 3.7 ± 0.4 |
| Five-minute Apgar score [media (range)] | 9 (8–9) | 9 (8–9) |