 Higher bilirubin levels in adults are found also in non-Hispanic white population (0.63 ± 0.004 mg/dL) and Mexican American population (0.61 ± 0.005 mg/dL) while lower in non-Hispanic black population (0.55 ± 0.005 mg/dL).Bilirubin levels are higher in active smokers.Jaundice in infants presents with yellowed skin and icteral sclerae.