Table 1 Clinical characteristics of the study population

Patients (n)

233

56

-

Age(years)

30.96 ± 4.12

32.27 ± 3.89

0.28

Gravidity

3(2–4)

3(2–5)

0.044

the incidence of twin pregnancies (n[%])

46 [19.7%]

7 [12.5%]

0.209

Prior ssA-PTB

1(0.5-2)

1(1–2)

< 0.001

Prior failed transvaginal cerclage

4[1.7%]

6[10.7%]

0.005

Prior operative hysteroscopy (n[%])

53[23%]

8[14%]

0.164

Prior cervical surgery (n[%])

11[5%]

5[10%]

0.216

Conception by IVF(n[%])

68[29%]

19[34%]

0.487

Emergency cervical cerclage (n[%])

160[68%]

0[0]

< 0.001

GA at cerclage placement (weeks)

22.4 (17-24.7)

before pregnancy or during the first trimester

-

Bleeding during the CC (ml)

15.6 ± 6.8

20.3 ± 5.2

0.37

The length of the cervix (cm)

1.2 (0.8-2)

-

-

Emergency CC

1 (0.6–1.5)

prophylactic CC

2.12 (1.5-3.0)

-

Cervical dilation at diagnosis (cm)

0(0-0.5)

-

-