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Nutr Diabetes ; 12(1): 25, 2022 04 25.
Article in English | MEDLINE | ID: mdl-35468888

ABSTRACT

BACKGROUND: Inappropriate weight gain may increase the risk of gestational diabetes mellitus (GDM). However, the relationship between pre-pregnancy body mass index (BMI), weight gain, and GDM has not been precisely quantified. This study aimed to explore whether gestational weight gain played a mediating role between pre-pregnancy BMI and GDM and whether the mediating effect was sex specific. METHODS: This study established a population-based observational cohort to assess weight gain in pregnant women. Mediation analyses were performed to quantify whether weight gain mediated the association between pre-pregnancy BMI and GDM. RESULTS: A total of 67,777 pregnant women were included in the final analysis, among whom 6751 (10.0%) were diagnosed with GDM. We verified that both pre-pregnancy BMI and weight gain were associated with GDM, and that BMI negatively contributed to weight gain. We also found that weight gain had a significant mediating effect on the relationship between pre-pregnancy BMI and GDM (Za × Zb confidence intervals [CIs] 0.00234-0.00618). Furthermore, the effect was sex-specific, in that it was only significant in overweight women carrying female fetuses (Za × Zb CIs 0.00422-0.01977), but not male fetuses (Za × Zb CIs -0.00085 to 0.01236). CONCLUSIONS: Weight gain during pregnancy had a fetal sex-specific mediating effect between pre-pregnancy BMI and GDM.


Subject(s)
Diabetes, Gestational , Gestational Weight Gain , Body Mass Index , Female , Humans , Male , Overweight/complications , Pregnancy , Weight Gain
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