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Interpregnancy Interval After Healthy Live Birth and Subsequent Spontaneous Abortion
Xuan Hu1,2,3, Ying Yang1,3,4, Long Wang5
1National Research Institute for Family Planning, Beijing, China.
JAMA Network Open
|June 17, 2024
Summary
Short interpregnancy intervals (less than 18 months) or long interpregnancy intervals (36 months or more) after a healthy live birth are linked to a higher risk of subsequent spontaneous abortion (SA). Planning pregnancy spacing is crucial for reproductive health.
Area of Science:
- Reproductive Health
- Perinatal Outcomes
- Epidemiology
Background:
- Interpregnancy interval (IPI) is a recognized modifiable risk factor for adverse perinatal outcomes.
- The association between IPI after live birth and subsequent spontaneous abortion (SA) requires further investigation.
Purpose of the Study:
- To investigate the association between interpregnancy interval (IPI) after a healthy live birth and the risk of subsequent spontaneous abortion (SA).
Main Methods:
- Prospective cohort study of 180,921 women aged 20-49 years in China.
- IPI categorized as <18 months, 18-23 months, 24-35 months, 36-59 months, and ≥60 months.
- Logistic regression models and restricted cubic splines used to analyze SA risk and dose-response associations.
Main Results:
- A J-shaped association was observed between IPI and SA risk.
- Compared to IPIs of 18-23 months, both short (<18 months) and long (≥36 months) IPIs were associated with increased SA risk.
- Specifically, IPIs <18 months (OR, 1.15) and IPIs ≥36 months (ORs ranging from 1.28 to 2.13) showed significantly higher odds of SA.
Conclusions:
- Interpregnancy intervals shorter than 18 months or longer than 36 months after a healthy live birth are associated with an increased risk of subsequent spontaneous abortion.
- Findings support informed prepregnancy planning to optimize pregnancy spacing and potentially reduce SA risk.
- This research contributes to improving reproductive and neonatal outcomes through evidence-based recommendations.
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