Table 5.

Factors associated with the use or nonuse of warfarin^a

Variable	Odds ratios (95% CI)b		P value
History of AF	16.7	(4.0–69.7)	0.0001
History of venous thrombo-embolism	14.1	(3.6–54.7)	0.0001
Agec	0.96	(0.93–0.99)	0.083
Ischemic infarctd	0.13	(0.05–0.32)	<0.0001

^a Note: Multivariate model. Warfarin versus aspirin alone or no-antithrombotic

^bOdds ratio >1, more likely to be using any antithrombotic

^cper year older

^dDuring index admission.