| Summary: | Objectives: To determine the association between gestational age and anterior uterocervical angles measured between 16 and 24 weeks of pregnancy.Materials and Methods: A descriptive cross-sectional study was conducted among pregnant women at gestational age between 16-24 weeks, specifically in those who had access to the antenatal care clinic at Rajavithi hospital, Bangkok, Thailand, between July 2017 and March 2018. The women underwent anterior uterocervical angle measurements by means of transvaginal ultrasonography, which was performed by a well-trained sonographer. A correlation and regression analysis between the anterior uterocervical angles and the gestational weeks were carried out, while a predictive nomogram of the anterior uterocervical angle was developed for potential cases of angle changes associated with advancing gestational age. Results: A total of 249 pregnancies (at least 15 measurements per week of gestation) were included in the study. The anterior uterocervical angle was not significantly associated with gestational age at 16 0/7 – 24 6/7 weeks (Pearson’s correlation, r = 0.038, p = 0.553). From the linear regression analysis, the parity was the significant factor associated with anterior uterocervical angle (p < 0.001). The mean ± standard deviation of anterior uterocervical angles were 96.1 ± 21.5 degrees and 108.9 + 20.0 degrees in the nulliparity and the multiparity groups, respectively.Conclusion: The anterior uterocervical angle at 16-24 weeks was found to be independent of the gestational age. However, it was still significantly related to the parity.
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