Total serum bilirubin ( sum of indirect and direct ) concentration increased significantly after drinking from baseline to 24h in non-smokers ( from M = 0.38 , SD = 0.24 to M = 0.51 , SD = 0.30 , F ( 1,32.2 ) = 24.24 , p < .0001 ) but not in smokers ( from M = 0.25 , SD = 0.12 to M = 0.26 , SD = 0.15 , F ( 1,31.1 ) = 0.04 , p = 0.84 ) .