Plasma glycemic measures and fecundability in a Singapore preconception cohort study
See Ling Loy, Chee Wai Ku, Ada En Qi Lai, Xin Hui Choo, Angela Hui Min Ho, Yin Bun Cheung, Keith M Godfrey, Yap-Seng Chong, Peter D Gluckman, Lynette Pei-Chi Shek, Kok Hian Tan, Fabian Kok Peng Yap, Shiao-Yng Chan, Jerry Kok Yen Chan, See Ling Loy, Chee Wai Ku, Ada En Qi Lai, Xin Hui Choo, Angela Hui Min Ho, Yin Bun Cheung, Keith M Godfrey, Yap-Seng Chong, Peter D Gluckman, Lynette Pei-Chi Shek, Kok Hian Tan, Fabian Kok Peng Yap, Shiao-Yng Chan, Jerry Kok Yen Chan
Abstract
Objective: To examine the association between plasma glycemia in women attempting to conceive and fecundability, as measured by time to pregnancy.
Design: Prospective preconception population-based study.
Setting: Hospital.
Patient(s): Asian preconception women, 18-45 years old, attempting conception for ≤12 cycles at study entry.
Intervention(s): None.
Main outcome measure(s): We ascertained time to pregnancy within a year of glycemic assessment in menstrual cycles. We estimated fecundability ratios (FRs) and 95% confidence intervals using discrete-time proportional hazards models, adjusting for age, ethnicity, education, body mass index, and cycle regularity and accounting for left truncation and right censoring.
Result(s): We studied a population sample of 766 women from the Singapore Preconception Study of Long-Term Maternal and Child Outcomes prospective cohort. Compared with women with normoglycemia, women with dysglycemia (prediabetes and diabetes, defined by the American Diabetes Association) had a lower FR (0.56). Compared with the respective lowest quintiles, women in the highest quintile of fasting glucose (≥5.1 mmol/L) had an FR of 0.60, while women in the highest 2-hour postload glucose quintile (≥6.9 mmol/L) had an FR of 0.66. Overall, the FRs decreased generally across the range of fasting and 2-hour plasma glucose. Glycated hemoglobin was not associated with fecundability.
Conclusion(s): Increasing preconception plasma glucose is associated with reduced fecundability, even within the normal range of glucose concentrations.
Clinical trial registration number: NCT03531658.
Keywords: Diabetes; HbA1c; fertility; preconception; time to pregnancy.
Copyright © 2020 American Society for Reproductive Medicine. All rights reserved.
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Source: PubMed