Fig. 2: Exposure-response relationships between NOx and mortality.
From: Associations of long-term exposure to nitrogen oxides with all-cause and cause-specific mortality
Associations were assessed utilizing a restricted cubic spline function with 3 knots in time-varying Cox regression, with the adjustment of age, sex, ethnicity, body mass index, education, occupation, smoking status, alcohol consumption, physical activity, residential area, and household income. The minimum concentration of NOx was 0.68 μg/m3, which served as the reference. The lines represent the point estimates, and shaded areas indicate corresponding 95% confidence intervals. The dashed vertical lines are 25th and 75th percentiles of NOx (16.27 μg/m3 and 30.42 μg/m3). Source data for Fig. 2 are provided as Source Data 2.
