PREVALENCE OF PRETERM BIRTH AND ASSOCIATED FACTORS IN ASYMPTOMATIC SINGLETON PREGNANCIES AT CAN THO OBSTETRICS AND GYNECOLOGY HOSPITAL
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Abstract
Objective(s): To determine the prevalence of preterm birth and evaluate associated factors in asymptomatic singleton pregnant women aged 18+0 to 24+0 weeks of gestation at Can Tho Obstetrics and Gynecology Hospital.
Methods: A retrospective cohort study was conducted on 687 asymptomatic singleton pregnant women at 18+0 to 24+0 weeks of gestation who underwent transvaginal ultrasound for cervical length (CL) and uterocervical angle (UCA) measurements and were followed up until delivery at Can Tho Obstetrics and Gynecology Hospital from October 2025 to June 2026. Univariate and multivariate logistic regression analyses were performed to identify factors associated with preterm birth.
Results: The prevalence of preterm birth was 13.4% (92/687 cases). Mean CL was 35.9 ± 6.2 mm (4.8% ≤ 25 mm) and mean UCA was 94.0 ± 23.4° (48.8% ≥ 95°). Multivariate analysis identified two factors independently associated with preterm birth: UCA ≥ 95° (aOR = 3.17; 95% CI: 1.92 – 5.21, p < 0.001) and history of preterm birth (aOR = 3.44; 95% CI: 1.08 – 10.97, p = 0.037). CL ≤ 25 mm was not significant (aOR = 1.80, p = 0.189), as 91.3% of preterm births occurred in women with CL > 25 mm.
Conclusion: The prevalence of preterm birth among asymptomatic singleton pregnant women at Can Tho Obstetrics and Gynecology Hospital was 13.4%. Second-trimester uterocervical angle UCA ≥ 95° and history of preterm birth are strong independent predictors of preterm delivery.
Keywords
Preterm birth, uterocervical angle, cervical length, asymptomatic singleton pregnancy
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References
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