Maternal mid-pregnancy lipids and birthweight

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Abstract

Objective To describe associations between maternal lipids and birthweight and to determine whether pre-pregnancy body mass index (BMI) modifies these associations. Design Cohort study. Setting Multiple communities in Michigan, USA. Population Participants were a sub-cohort of women from the multi-community Pregnancy Outcomes and Community Health (POUCH) study (1998-2004). Methods Maternal total cholesterol, high-density lipoprotein (HDLc), and low-density lipoprotein (LDLc) cholesterol, and triglycerides were assessed at 16-27 weeks' gestation. Women were classified as having normal (<25 kg/m2) or overweight/obese (≥25 kg/m2) pre-pregnancy BMI. Main outcome measures Sex-and gestational-age-specific body weight z-score (BWz). Results Regression models examined associations among lipids (low: 1st quartile, referent: middle quartiles, high: 4th quartile) and BWz for the total sample and stratified by pre-pregnancy BMI. In adjusted analyses (n = 1207), low HDLc was associated with lower BWz (β =-0.23, 95% CI-0.40 to-0.06), whereas high triglycerides were associated with higher BWz (β = 0.23, 95% CI 0.06-0.41). Once stratified by pre-pregnancy BMI, low total cholesterol was associated with lower BWz in normal BMI women (β =-0.25, 95% CI-0.47 to-0.03), whereas in overweight/obese BMI women, high HDLc was inversely (β =-0.29, 95% CI-0.54 to-0.04) and high triglycerides were directly associated with BWz (β = 0.32, 95% CI 0.07-0.54). Removing women with gestational diabetes/hypertensive disorders did not alter the results. Conclusions The associations between maternal lipids and BWz vary by lipid measure and pre-pregnancy BMI. Future work should examine whether lipids and pre-pregnancy BMI make unique contributions to the fetal programming of disease.

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Mudd, L. M., Holzman, C. B., & Evans, R. W. (2015). Maternal mid-pregnancy lipids and birthweight. Acta Obstetricia et Gynecologica Scandinavica, 94(8), 852–860. https://doi.org/10.1111/aogs.12665

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