Figure 3. Incidence Density of Ischemic Stroke Among the Atrial Fibrillation (AF), Atrial Flutter (AFL), and Matched Control Cohorts With Different CHA₂DS₂-VASc Scores.

Dashed line indicates the cutoff value of the annual incidence (1.7%) needed to be prescribed anticoagulation drugs; dotted line, the cutoff value of the annual incidence (0.9%) needed to be prescribed non–vitamin K oral anticoagulants according to the study by Eckman et al.³⁴

^aP < .001 for AF vs AFL cohorts.

^bP < .001 for AFL vs matched control cohorts.