Table 3.

Warfarin Prescription by Patient Age and CHADS₂ Score Level for Patients with Atrial Fibrillation 2010 NAMCS Data (weighted n = 7669844)

CHADS2 Score	Patient Age	Warfarin Prescription Status
		No		Yes
		#	%	#	%
Low Score (0–1)	18–39	80454	100.0	0	0
	40–64	1172589	87.6	165537	12.4
	≥65	1994254	91.6	183278	8.4
High Score (2 And Higher)	18–39	0	0	0	0
	40–64	158286	67.0	77884	33.0
	≥65	2891785	75.4	945777	24.6
Total	18–39	80454	100.0	0	0
	40–64	1330875	84.5	243421	15.5
	≥65	4886039	81.2	1129055	18.8