Cervical length

P

<25 mm

>25 mm

Control group

Term

5 (23.9%)

16 (66.7%)

0.004*

Preterm

16 (76.1%)

8 (33.3%)

Study group

Term

16 (80.0%)

19 (76.0%)

0.74

Preterm

4 (20.0%)

6 (24.0%)