Abstract
OBJECTIVE
The purpose of this study was to investigate whether isolated maternal hypothyroxinaemia (IMH) is associated with risks of small/large-for-gestational-age (SGA/LGA) infants.
DESIGN
Population-based prospective cohort study.
SETTING
Ma'anshan Maternal and Child Health (MCH) clinics, China.
POPULATION
Pregnant women with singleton births (n = 3178).
METHODS
Descriptive statistics were calculated for the demographic characteristics of the mothers and their newborns. Linear regression was applied to estimate the association between thyroid hormone levels and birthweight. Logistic regression was performed to calculate the association between IMH and SGA/LGA.
MAIN OUTCOME MEASURES
Outcomes included SGA/LGA.
RESULTS
The prevalence of IMH, defined as a free thyroxine value (FT4) lower than the 2.5th percentile with normal thyroid stimulating hormone, was 2.5% (78/3080) and 2.5% (74/2999) in the first and second trimesters, respectively. Additionally, 306 (9.6%) and 524 (16.5%) infants were defined as SGA and LGA, respectively. No evidence supported the notion that IMH is associated with an increased risk for SGA in either the first [odds ratio (OR): 1.762, 95% confidence interval (CI): 0.759-4.089] or the second (OR: 0.763, 95% CI: 0.231-2.516) trimester. However, an increased risk of LGA was observed among IMH women in the second trimester (OR: 2.088, 95% CI: 1.193-3.654). Maternal TPO-Ab positivity in the second trimester increased the risk of SGA (OR: 2.094, 95% CI: 1.333-3.290).
CONCLUSION
This study provides evidence that IMH is associated with LGA.
FUNDING
This work was supported by the National Natural Science Foundation of China (No. 81330068).
TWEETABLE ABSTRACT
Isolated maternal hypothyroxinaemia may increase the risk of large-for-gestational-age infants.
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