Fig. 1From: Low birthweight in term singletons mediates the association between maternal smoking intensity exposure status and immediate neonatal intensive care unit admission: the E-value assessmentDirected acyclic graph of the hypothesized relationship between maternal smoking intensity status and NICU transfer/admission. Boxed variables are used for adjustment in the model to control for confounding; LBW: low birthweight; NICU: neonatal intensive care unitBack to article page