Figure 2
Kaplan–Meier curves for risk categories according to PM-CHA2DS2-VASc, PM-CHADS2, and PM-HATCH scores. Patients were divided into three groups as low (0–1 points), intermediate (2–3 points), and high risk (≥ 4 points) groups. We pointed as 1 if PM2.5 ≥ 15 μg/m3 based on Korean National Ambient Air Quality Standards.
