The Risk of Spontaneous Preterm Birth according to Maternal Pre-pregnancy Body Mass Index in Twin Gestations.

J Korean Med Sci · 2018 · PMC5865054 · PMID 29573249

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did not reach statistical significanceno p-value reported

However, the risk of total or spontaneous PTB between the underweight group and the normal group did not reach statistical significance ( P = not significant).

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