Folic acid supplementation, dietary folate intake during pregnancy and risk for spontaneous preterm delivery: a prospective observational cohort study.

BMC Pregnancy Childbirth · 2013 · PMC3751653 · PMID 23937678

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marginally significantno p-value reported

The marginally significant association with decreased HRs for first-trimester supplementation was no longer significant if the model was adjusted for vitamin A supplementation (data not shown).

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