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. 2021 Feb 22;143(16):1584–1596. doi: 10.1161/CIRCULATIONAHA.120.050252

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© 2021 The Authors.

Circulation is published on behalf of the American Heart Association, Inc., by Wolters Kluwer Health, Inc. This is an open access article under the terms of the Creative Commons Attribution Non-Commercial-NoDerivs License, which permits use, distribution, and reproduction in any medium, provided that the original work is properly cited, the use is noncommercial, and no modifications or adaptations are made.

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Figure 3. — Effect measure modification analyses: full range of exposure concentration. Effect measure modification analyses: median risk difference (95% CI) for each unit increase in air pollutants and hospital admission with myocardial infarction (A), stroke(B), atrial fibrillation (C), and pneumonia (D) across the full range of exposure, within strata. Pairwise comparisons of coefficients were conducted. *Statistically significant differences (P<0.05). NO₂, nitrogen dioxide; NS, nonsignificant difference; O₃, tropospheric ozone; and PM_2.5, fine particulate matter with an aerodynamic diameter <2.5 micrometers.