Investigating the association between prepregnancy body mass index and adverse pregnancy outcomes: a large cohort study of 536 098 Chinese pregnant women in rural China.

BMJ Open · 2016 · PMC4964214 · PMID 27439613

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marginally significantno p-value reported

Prepregnancy underweight was significantly associated with the increased risk for PTB, while obesity only had a marginally significant risk ( table 5 ).

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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.