| Valuables (n = 330) | Median (range) or n (%) |
| Maternal age, y | 30.1 (18.9 - 42.4) |
| <20 | 7 (2.1) |
| 20 - 30 | 148 (44.8) |
| 30 - 40 | 168 (50.9) |
| 40< | 7 (2.1) |
| Multipara | 186 (56.4) |
| Previous preterm delivery | 33 (17.7) |
| Cervical cerclage | 43 (13.0) |
| Cesarean section | 175 (53.0) |
| Usage of tocolytics | 310 (93.9) |
| Ritodrine chloride, | 309 (93.6) |
| Magnesium sulfate | 168 (50.9) |
| Betamethasone | 161 (48.6) |
| Antibiotics | 290 (87.9) |
| Abruption placenta | 19 (5.8) |
| Cord prolapse | 10 (3.0) |
| Latency period of PROM, days | 4 (0 - 69) |
| Less than 2 | 104 (31.5) |
| 2 to 9 | 136 (41.2) |
| 9 to 16 | 36( 10.9) |
| 16 or more | 54 (16.4) |
| Excessive fever (˚C)a | 35 (10.6) |
| CRPa > 2.0 mg/dl | 165 (50.0) |
| WBCb > 15,000/mm3 | 93 (28.2) |