Figure 4From: Effects of tobacco smoking during pregnancy on oxidative stress in the umbilical cord and mononuclear blood cells of neonatesLumen area analysis. Bar graphs showing percentage of cross-sectional luminal areas of arteries (white bars) and veins (black bars) from the umbilical cord of the non-smokers group (n = 10) and the smokers group (n = 12). The values are presented as means ± SEM.Back to article page