Table 1.

Risk Weights for Ischemic Stroke and Major Bleeding*

Clinical factor	Risk weights for
	Ischemic stroke	Major bleed
History of diabetes mellitus	0.57
History of hypertension	0.49
History of congestive heart failure	0.36
History of myocardial infarction	0.2
Prior stroke/TIA
Either past or present	0.99	0.84
Both past and present		1.69
Age
<60	0	0
60–64	0.34†	0
65–69	0.34	1.03‡
70–79	0.68	1.03
80–89	1.02	1.03
History of gastrointestinal bleeding		1.12
Serious comorbid condition		1.04

Reprinted with permission from MH Eckman et al. Chest 1998 (114)

*This table should not be used for patients with “lone atrial fibrillation” younger than 65 years of age, as this is the referent group against which the weights for clinical risk factors were calculated. These patients have an annual stroke rate of 1%

†Increased risk per decade over age 60 years

‡Age ≥65 years