Abstract
Aims
To assess the association between maternal diabetes characteristics and sex ratio at birth (SRB) in women with type 1 diabetes mellitus.
Methods
We performed a case–control study. The study subjects were infants born alive to women with type 1 diabetes and singleton pregnancies. Cases and controls were defined as male and female newborns, respectively. SRB was analysed according to diabetes-related characteristics adjusting in a logistic regression analysis for maternal characteristics known to affect SRB in the general population.
Results
The observed SRB (238 males/468 live births = 0.509) did not differ from the expected. In the logistic regression analysis, SRB was significantly associated with three diabetes characteristics: (1) diabetes duration, with odds ratios (ORs) for a live male newborn = 1.22 (95 % confidence interval (CI), 0.66–2.24 for ≤5 years, OR 2.79 (95 % CI 1.36–5.74) for >20 years; (2) mean first-trimester glycated haemoglobin, with OR 1.98 (95 % CI 1.09–3.62) for ≤6.7 % (50 mmol/mol) and OR 2.61 (95 % CI 1.16–5.85) for >8.2 % (66 mmol/mol) and (3) mean first-trimester insulin dose, with OR 0.70 (95 % CI 0.36–1.38) for ≤0.5 IU/kg/day and OR 0.18 (95 % CI 0.05–0.59) for >1.0 IU/kg/day.
Conclusions
We conclude that SRB in this cohort is independently associated with three diabetes characteristics. These associations are to be confirmed.
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Acknowledgments
We thank Carolyn Newey for language assistance.
Author contributions
Dr. R. C. had full access to all of the data in the study and takes responsibility for the integrity of the data and the accuracy of the data analysis. A. G. P. and R. C. designed and conducted the study, performed data collection and analysis and wrote the manuscript. I. M. contributed to design, data collection and analysis of this manuscript. J. M. A. contributed to data collection and analysis of this manuscript. I. G., T. P. and A. L. contributed to design and analysis of this manuscript.
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Apolonia García-Patterson, Inka Miñambres, Juan María Adelantado, Ignasi Gich, Teresa Puig, Alberto de Leiva and Rosa Corcoy declare that they have no conflict of interest.
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All procedures followed were in accordance with the ethical standards of the responsible committee on human experimentation (institutional and national) and with the Helsinki Declaration of 1975, as revised in 2008.
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The institutional review board that waived the obtainment of informed consent approved the study.
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García-Patterson, A., Miñambres, I., Adelantado, J.M. et al. Sex ratio at birth is associated with type 1 diabetes characteristics. Acta Diabetol 53, 1025–1035 (2016). https://doi.org/10.1007/s00592-016-0919-0
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DOI: https://doi.org/10.1007/s00592-016-0919-0