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Table 4 Direction of associations between maternal underweight and obesity and early and late medically-induced and spontaneous PTB compared to term births

From: Prepregnancy body mass index and risk of preterm birth: association heterogeneity by preterm subgroups

  Medically-induced PTB Spontaneous PTB
Early Late Early Late
Maternal underweight
Maternal obesity
  1. ─no association; ↑ = increased odds; ↓ = decreased odds.