Table 2.
Comparison of pregnancy characteristics between study and reference groups
| Study group (n = 112) |
Reference group (n = 224) |
P value | |
|---|---|---|---|
| ART (%) | 9.4 (12) | 2.2 (5) | 0.001# |
| Gestation age at birth (weeks) | 37.9 ± 1.6 | 39.3 ± 1.2 | 0.000& |
| Gestation age at birtha (weeks) | 38.6 ± 0.9 | 39.4 ± 1.0 | 0.000& |
| Cervical incompetence | 1/112 | 0/224 | / |
| PROM (%/n) | 21.4 (24) | 25.4 (57) | 0.417# |
| CAN (%/n) | 54.5 (61) | 29.9 (67) | 0.000# |
| CAN three times (%/n) | 7.1 (8) | 0.4 (1) | 0.001§ |
| Manual placenta removal (%/n) | 9.8 (11) | 4.0 (9) | 0.034# |
| Postpartum hemorrhage (%/n) | 2.7 (3) | 4.5 (10) | 0.617§ |
| Uterotonic usage (%/n) | 40.2 (45) | 37.5 (84) | 0.634# |
| Oligohydramnios (%/n) | 3.6 (4) | 0.9 (2) | 0.098§ |
| Hypertensive disorders (%/n) | 4.5 (5) | 6.7 (15) | 0.415# |
| Gestational diabetes (%/n) | 17.0 (19) | 14.7 (33) | 0.594# |
| ICP (%/n) | 2.7 (3) | 1.3 (3) | 0.404* |
| Placenta previa (%/n) | 2.7 (3) | 0.4(1) | 0.110* |
| Placental abruption (%/n) | 0.9 (1) | 1.8 (4) | 0.668* |
Data are presented as percent (numbers) or mean ± SD
ART, assisted reproductive technology; PROM, premature rupture of membranes; CAN, cord-around-the neck; ICP, intrahepatic cholestasis of pregnancy
a Excluding the preterm births
# Chi-squared test *Fisher’s exact test §Yates correction for continuity
&Student’s t-test