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Recurrent miscarriage and birth sex ratio
Summary
The sex ratio of births is subtly linked to secondary recurrent miscarriage (SRM), but not primary recurrent miscarriage (PRM). This finding suggests a potential connection between birth sex patterns and certain types of miscarriage.
Area of Science:
- Reproductive Medicine
- Human Genetics
- Obstetrics
Background:
- Recurrent miscarriage (RM) affects a significant number of women.
- The etiology of unexplained recurrent miscarriage remains largely unknown.
- Investigating potential contributing factors, such as birth sex ratios, is crucial.
Purpose of the Study:
- To investigate the association between the sex ratio of births and unexplained recurrent miscarriage (RM).
- To differentiate potential relationships in primary recurrent miscarriage (PRM) versus secondary recurrent miscarriage (SRM).
Main Methods:
- A retrospective, observational study was conducted.
- Data from 138 women with PRM and 170 women with SRM were analyzed.
- The sex ratio of the first and subsequent births served as primary outcome measures.
Main Results:
- In women with SRM, the sex ratio of the first stillbirth was significantly higher than the general population (10:2 vs. 1.05).
- A male firstborn in SRM cases was associated with a significantly lower subsequent birth sex ratio compared to the general population (OR=0.57).
- These associations were not observed in women with PRM.
Conclusions:
- A subtle relationship exists between birth sex patterns and secondary recurrent miscarriage.
- No significant relationship was found between birth sex ratios and primary recurrent miscarriage.
- The findings highlight a potential, albeit subtle, link between sex of offspring and specific types of RM.
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