OP01. 01: A longitudinal study of sonographic cervical length in nulliparous and multiparous women Academic Article uri icon


  • Objective The purpose of this study was to determine the changes in transvaginal sonographic (TVS) cervical length with gestational age in nulliparous and parous women. The justification for this study is the conflicting evidence about cervical length according to parity and the importance of a longitudinal study to characterize changes in cervical length over time. Methods This study included 5,186 singleton pregnancies (3,398 multiparous and 1,788 nulliparous) with≥ 3 TVS cervical length measurements who delivered at term. All patients had the first cervical length measurement between 14–24 weeks. A Generalized Estimating Equations model was used to fit TVS cervical length measurements versus gestational age (and its square), as well as parity, maternal age, and the interaction term between gestational age and parity. A “moving window” approach was used to determine …

publication date

  • January 1, 2009