Table 3.
Univariate analysis of risk factors among preterm deliveries less than 34 weeks.
| <34 weeks (n = 20) | ≥34 weeks (n = 103) | P-value | |
|---|---|---|---|
| Age, median (IQR) | 34 (32–36) | 33 (30–37) | 0.488 |
| Primiparous, n (%) | 9 (45) | 35 (34) | 0.445 |
| Pregnancy by ART, n (%) | 1 (5) | 13 (13) | 0.691 |
| Presence of cervical polyp, n (%) | 1 (5) | 7 (7) | 1.000 |
| History of cerclage, n (%) | 0 (0) | 7 (7) | 0.597 |
| History of CS, n (%) | 1 (5) | 20 (19) | 0.192 |
| History of myomectomy, n (%) | 1 (5) | 1 (1) | 0.300 |
| Slight bleeding at admission, n (%) | 2 (10) | 5 (5) | 0.318 |
| Presurgical CL, mm (IQR) | 8 (0–21) | 16 (10–21) | 0.082 |
| Presurgical CL 0 mm, n (%) | 8 (40) | 12 (12) | 0.003 |
| Presence of sludge in ultrasound, n (%) | 8 (40) | 16 (16) | 0.029 |
| Presence of Lactobacillus | 14 (70) | 75 (73) | 0.782 |
| Presence of ureaplasma | 7 (35) | 35 (34) | 1.000 |
| Cervical elastase positive, n (%) | 4 (20) | 16 (16) | 0.272 |
| GA at emergency cerclage, week (IQR) | 21 (18–24) | 22 (20–23) | 0.377 |
| History of SPTB, n (%) | 8 (40) | 22 (21) | 0.091 |
| History of cerclage, n (%) | 1 (5) | 9 (9) | 0.687 |
| Duration between cerclage and discharge (days), median (IQR)∗ | 35 (21–84) | 76 (13–98) | 0.057 |
ART, assisted reproductive technology; CL, cervical length; CS, cesarean section; GA, gestational age; IQR, interquartile range; SPTB, spontaneous preterm birth. ∗Long-term tocolysis and hospitalization management was employed for the majority of the patients. Thus, the duration of hospitalization was not included in logistic regression analysis.