Figure 2
From: Adverse effects of parental smoking during pregnancy in urban and rural areas
GAM-estimated relationships between parental smoking amount and LBW (A-C) and preterm birth (D-F), adjusted for birth order. The solid lines indicate the estimated mean percentage of change in birth outcomes, and the dotted lines represent 95% confidence interval. Note. famount = paternal smoking amount; mamount = maternal smoking amount; pamount = smoking amount in both parents.