Table 1. Characteristics of Enrolled Patients .
| Case no. | Age | Parity |
Obstetric history | GA | |||
|---|---|---|---|---|---|---|---|
| TD | PTD | A | LS | ||||
| 1 | 31 | 0 | 0 | 1 | 0 | One abortion | 23.4 |
| 2 | 32 | 0 | 1 | 0 | 0 | One preterm delivery at 26 weeks | 16.2 |
| 3 | 20 | 0 | 1 | 1 | 0 | One preterm delivery at 26 weeks | 20.6 |
| 4 | 38 | 0 | 0 | 1 | 0 | One abortion | 18.6 |
| 5 | 33 | 1 | 0 | 1 | 1 | One spontaneous delivery at term, one abortion | 23.2 |
| 6 | 22 | 0 | 0 | 2 | 0 | Two abortions | 24.4 |
| 7 | 32 | 1 | 0 | 1 | 1 | One spontaneous delivery at term, one abortion | 25.3 |
| 8 | 22 | 0 | 0 | 0 | 0 | - | 23.0 |
| 9 | 33 | 0 | 2 | 0 | 0 | Two preterm deliveries | 16.2 |
| 10 | 28 | 0 | 0 | 0 | 0 | Bicornuate uterus | 21.0 |
| 11 | 33 | 1 | 1 | 1 | 1 | One spontaneous delivery at term, one preterm delivery, one abortion | 16.1 |
| 12 | 24 | 1 | 0 | 1 | 1 | One spontaneous delivery at term, one tubal pregnancy | 24.1 |
GA: gestational age (weeks) at time of cervical cerclage; TD: deliveries at term; PTD: preterm deliveries; A: abortion; LS: living sons.