Abstract
Bilirubin concentrations have been recently reported to be negatively associated with type 2 diabetes mellitus. We examined the association between bilirubin concentrations and gestational diabetes mellitus. In a prospective cohort study, 2969 pregnant women were recruited prior to 16 weeks of gestation and were followed up until delivery. The value of bilirubin was tested and oral glucose tolerance test was conducted to screen gestational diabetes mellitus. The relationship between serum bilirubin concentration and gestational weeks was studied by two-piecewise linear regression. A subsample of 1135 participants with serum bilirubin test during 16–18 weeks gestation was conducted to research the association between serum bilirubin levels and risk of gestational diabetes mellitus by logistic regression. Gestational diabetes mellitus developed in 8.5 % of the participants (223 of 2969). Two-piecewise linear regression analyses demonstrated that the levels of bilirubin decreased with gestational week up to the turning point 23 and after that point, levels of bilirubin were increased slightly. In multiple logistic regression analysis, the relative risk of develo** gestational diabetes mellitus was lower in the highest tertile of direct bilirubin than that in the lowest tertile (RR 0.60; 95 % CI, 0.35–0.89). The results suggested that women with higher serum direct bilirubin levels during the second trimester of pregnancy have lower risk for development of gestational diabetes mellitus.
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Acknowledgments
The authors would like to thank the women who took part in the study, the practices who allowed us to access their databases and the staff at the Primary Care Sciences Research Center who helped administer the project.
Funding
Funding was received from National Program on Basic Research Project of China (NO.2013FY114200) for Nianhong Yang.
Author contributions
CL produced the original idea, and CL, NY, LH and XY designed the study. CL and WW analyzed the data, CZ, XZ, RC, JW, XL, HD, YG, QG, XH, GX and MX performed the experiments. All authors wrote up the study.
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Approval was obtained from Tongji Medical College of Huazhong University of Science and Technology Committee.
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Liu, C., Zhong, C., Zhou, X. et al. Higher direct bilirubin levels during mid-pregnancy are associated with lower risk of gestational diabetes mellitus. Endocrine 55, 165–172 (2017). https://doi.org/10.1007/s12020-016-1103-6
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DOI: https://doi.org/10.1007/s12020-016-1103-6