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Observed/expected ratio for thromboembolic events based on CHAD2DSs-VASc (Congestive Heart Failure, Hypertension, Age [≥ 75 Years] [doubled], Diabetes Mellitus, Stroke [doubled], Vascular Disease, Age [65-74] Years, Sex Category [Female]) and CHADS2 (Congestive Heart Failure, Hypertension, Age ≥ 75, Diabetes, and Prior Stroke/Transient Ischemic Attack [doubled]) scores. RR, relative reduction; SE, systemic embolization; TIA, transient ischemic attack.
