Table 1 Comparison of predictive factors between < 7 days and ≥ 7days of interval-to-delivery
Baseline characteristics | Interval-to-delivery < 7 days (n = 23) | Interval-to-delivery ≥ 7 days (n = 125) | p |
|---|---|---|---|
Age (yrs) | 34.00 (31.00–35.00) | 33.00 (31.00–35.00) | NS |
Height (cm) | 162.60 (157.00-166.40) | 162.50 (158.70–166.00) | NS |
Weight (kg) | 67.00 (59.85–76.65) | 63.35 (57.25–70.80) | NS |
Body mass index (kg/m2) | 27.03 (21.87–29.35) | 23.47 (22.29–26.77) | NS |
Nulliparity (%) | 19/23 (82.6) | 94/125 (75.2) | NS |
Prior preterm birth (%) | 0/23 (0.0) | 7/125 (5.6) | NS |
Numerical rating scale pain score | 4.00 (3.00–6.00) | 3.00 (2.00-3.25) | < 0.001 |
Frequency of uterine contractions (numbers/10mins) | 3.00 (2.00–3.00) | 2.00 (0.55-3.00) | < 0.05 |
Cervical length (cm) | 0.29 (0.00-0.93) (n = 12) | 2.01 (1.20–3.01) (n = 113) | < 0.001 |
Cervical dilatation (cm) | 2.00 (1.00–3.00) | 0.00 (0.00–1.00) | < 0.001 |
Funneling (%) | 9/20 (45.0) | 28/113 (24.8) | NS |
Positive fetal fibronectin (%) | 14/16 (87.5) | 36/88 (40.9) | < 0.005 |
Tocolytics (%) | 16/23 (69.6) | 53/125 (42.4) | < 0.05 |
Gestation age at visit(weeks) | 31.30 (27.42–32.90) | 29.00 (25.51–31.41) | NS |
Delivery outcome | |||
Gestation age at delivery(weeks) | 31.57 (27.57–33.70) | 36.70 (34.27–37.30) | < 0.001 |
Interval to delivery (days) | 1.00 (0.00–4.00) | 43.00(30.50–66.50) | < 0.001 |