| Characteristics | Categorical variables n (%) |
| Maternal age, in years | 33.8 ± 4.3 |
| obstetric history, number of pregnancies, n (%) |
|
| 1 pregnancy | 80 (62.0) |
| 2 pregnancies | 30 (23.3) |
| 3 or more | 19 (14.7) |
| Previous deliveries, n (%) |
|
| None | 135 (94.6) |
| 1 or more | 7 (5.4) |
| Cesarean, n (%) |
|
| None | 104 (80.6) |
| 1 or more | 25 (19.4) |
| Miscarriage, n (%) |
|
| None | 105 (81.4) |
| 1 or more | 24 (18.6) |
| Diabetes Mellitus, n (%) | 17 (12.0) |
| Hypothyreoidism, n (%) | 7 (4.9) |
| Gestational age (IQR) | 38 (37 - 39) |
| Deliverie’s gestational age, n (%) |
|
| <34 | 6 (4.2) |
| 34 - 37 | 19 (13.4) |
| ≥37 | 117 (82.4) |
| Delivery, n (%) |
|
| Cesarean | 112 (86.0) |
| Vaginal | 30 (14.0) |