3. Limitations and advantages
The limitations of the present study are that the findings are not fully generalizable to the Chinese population as it is a single-center study with a moderate sample size. However, a major strength of this study is the direct clinical information gathered from our diverse and contemporary population that reflects current obstetric practice, as well as the large amount of data from 209 women with cervical insufficiency.
Conclusions
Previous multiple pregnancy, IVF-ET/ovulation induction conception, diabetes mellitus (GDM and PGDM), uterine malformations, and PCOS are risk factors for the incidence of CI, and the combination of multiple indicators has some predictive ability for cervical insufficiency.