Abstract
Objective
To explore whether a history of IUD use could increase the risk of subsequent preterm birth.
Methods
We performed a cohort study of 24,496 multipara aged 19–48 years in Dongguan City. Each subject was followed up for 1 year, and 12,508 women obtained pregnancy outcomes. They were divided into 2 groups: 2130 subjects with IUD use history (exposure group), and 10,378 subjects without IUD use history (control group). The exposure group will remove the IUD before pregnancy. The primary outcomes were preterm birth (less than 37 weeks of gestation) and early preterm birth (less than 34 weeks of gestation). We used log-binomial regression to estimate adjusted risk ratios (aRR) of preterm birth and early preterm birth for women with a history of IUD. According to the different adjusted baseline data, three regression models were established, and the propensity matching score method was also used to verify the stability of the results.
Results
The delivery rate of women with IUD history was 51.24%, and that of women without IUD was 51.03% (2 = 0.063, P = 0.802). Six hundred and eighty-five women had preterm birth (5.48%, 95% CI 5.08–5.88) and 133 women had early preterm birth (1.06%, 95% CI 0.83–1.24). Compared with the control group, the incidence of preterm birth and early preterm birth in the exposure group were significantly lower. The results are stable in all four models. Subgroup analysis also supported the result. This study also found that the longer the women used IUD before pregnancy, the younger the age of first using IUD, and the shorter the time from condom removal to pregnancy, the lower the incidence of premature birth.
Conclusion
The women with a history of IUD use are less likely to have premature birth after the IUD is removed. More prospective studies are needed to confirm it.
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Abbreviations
- NFPHEP:
-
National Free Preconception Health Examination Project
- IUD:
-
Intrauterine device
- RR:
-
Risk ratios
- PSM:
-
Propensity matching score method
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Acknowledgements
The authors thank all the obstetricians, pediatricians, pathologists and other participants involved in the birth defects monitoring program and pre-pregnancy examination project in Dongguan City. The author thanks Mr. Ri-Hui Liu for his great support and help in the statistical analysis and writing of their papers.
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This is not a funded research project so “not applicable”.
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All the authors contributed a lot to this research: BJ: protocol/project development, data collection or management, and manuscript writing/editing; W-CH: data collection or management and data analysis; J-YY: data collection or management and data analysis; S–SW: data collection or management; X-JZ: protocol/project development and data collection or management.
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This study was approved by the ethics committee of Dongguan Maternal and Child Health Hospital on September 30, 2018 (No. [23] 2018).
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Jiang, B., He, WC., Yu, JY. et al. History of IUD utilization and the risk of preterm birth: a cohort study. Arch Gynecol Obstet 305, 349–358 (2022). https://doi.org/10.1007/s00404-021-06158-9
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DOI: https://doi.org/10.1007/s00404-021-06158-9