Preconceptional folate supplementation and the risk of spontaneous preterm birth: a cohort study.

PLoS Med · 2009 · PMC2671168 · PMID 19434228

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a significant trendno p-value reported

There was also a significant trend of decreased risk of spontaneous preterm birth across the original seven categories of duration of folate supplementation.

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.