Fig. 2

Restricted cubic spline regression analysis for the mortality risk of asbestos-related lung cancer with pollutant exposure levels. Hazard ratio (HR, solid lines) and 95% confidence interval (CI, gray area) for risk of asbestos-related lung cancer mortality along with the changes of standardized (A) SO2, (B) CO, (C) NO2, (D) PM10, and (E) PM2.5 exposure levels from the restricted cubic splines regression model. Models were adjusted for age at diagnosis, sex, smoking status, cancer cell type, type of treatment, asbestos exposure modalities, and month of diagnosis