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Fig. 4 | BMC Pulmonary Medicine

Fig. 4

From: Association between elevated serum bilirubin levels with preserved lung function under conditions of exposure to air pollution

Fig. 4

a Estimated mean levels of FEV1 in low versus moderate and high levels of bilirubin to NOx adjusted for age, sex, BMI, diabetes, and smoking. FEV1 forced expiratory volume in 1 s, Nox nitrogen oxide, BMI body mass index. 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, respectively. Gray line: low NOx level 0.4–14.0 ppm; Black line: 14.1–22.1 ppm and 22.2–33.5 ppm. b Estimated mean levels of FEV1 in low versus moderate and high levels of exposure to CO adjusted for age, sex, BMI, diabetes, and smoking. FEV1 forced expiratory volume in 1 s, CO carbon monoxide, BMI body mass index. 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, respectively. Gray line: low CO level 0.1–0.7 ppm; Black line: 0.8–0.9 ppm and 1–1.2 ppm

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