Association of gestational weight gain patterns with preterm birth subtypes in a population based cohort study from China.

In normal (pre-pregnancy BMI: 18.5–23.9 kg/m 2 ) pregnant women, except for the association between total GWG and PPROM, which did not reach statistical significance (OR: 1.24, 95% CI: 0.99–1.54, P = 0.059), both insufficient and excessive weight gain—whether measured as total GWG in the first and second trimesters or as weekly eGWG—were statistically associated with an increased risk of all three PTB subtypes.

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