Fig. 2From: Association between elevated serum bilirubin levels with preserved lung function under conditions of exposure to air pollutionAssessment of FEV1 according to different levels of serum bilirubin. FEV1 forced expiratory volume in 1 s. Y axis—mean level of FEV1 percent of predictive values. X axis—bilirubin level (mg/dL) divided according to low, moderate, and high serum bilirubin; 0.1–0.59 mg/dL, 0.6–0.8 mg/dL and 0.81–1.47 mg/dL, respectivelyBack to article page