| N | Singleton N = 125 | Twins N = 34 | |
Age | years | 159 | 25 30 33 | 30 33 35 |
BMI | kg/m2 | 159 | 23 26 29 | 24 27 29 |
History of preterm birth |
| 159 | 11.2% (14) | 5.9% (2) |
Prity |
| 159 |
|
|
0 |
|
| 52.0% (65) | 64.7% (22) |
1 |
|
| 28.8% (36) | 17.6% (6) |
>1 |
|
| 19.2% (24) | 17.6% (6) |
Gravidity |
| 159 |
|
|
1 |
|
| 48.0% (60) | 61.8% (21) |
2 |
|
| 20.0% (25) | 14.7% (5) |
>2 |
|
| 32.0% (40) | 23.5% (8) |
Gestation age at hospitalization | day | 159 | 28 + 1 29 + 5 31 + 6 | 27 + 0 29 + 1 30 + 4 |
Cervical length | mm | 159 | 14.0 20.0 30.0 | 13.0 18.0 22.8 |
Lung maturation |
| 159 | 65.6% (82) | 91.2% (31) |
Gestation age at birth | day | 159 | 36 + 3 38 + 1 39 + 3 | 33 + 1 35 + 1 36 + 2 |
Fetal weight at birth | g | 157 | 2770 3050 3400 | 1962 2202 2551 |
Days of hospitalization | day | 132 | 2.00 4.00 8.00 | 4.75 7.50 13.25 |
Preterm birth before 37 + 0 weeks |
| 159 | 31.2% (39) | 85.3% (29) |
Preterm birth before 34 + 0 weeks |
| 159 | 8.8% (11) | 32.4% (11) |
Tocolysis | 159 | 84.8% (106) | 91.2% (31) | |
Vaginal bacterial or yeast colonization | 159 | 37.6% (47) | 26.5% (9) |