Table 1.
Characteristics of Patients with Atrial Fibrillation by Warfarin Status at Baseline, and by Time-varying Warfarin Status (Proportion of Person-years)
| No Warfarin | Warfarin | |||
|---|---|---|---|---|
| N (%) (n=6353) |
% Person-Years (32,610.6 PY) |
N (%) (n=7206) |
% Person-Years (32,132.4 PY) |
|
| Age category | ||||
| <65 years | 1491 (23.5%) | 23.8% | 1542 (21.4%) | 15.6% |
| 65–74 years | 1770 (26.1%) | 25.8% | 2614 (36.3%) | 31.5% |
| 75–84 years | 2165 (34.1%) | 34.1% | 2602 (36.1%) | 42.5% |
| ≥85 years | 927 (14.6%) | 16.3% | 448 (6.2%) | 10.4% |
| Women | 2857 (45.0%) | 42.8% | 2938 (40.8%) | 41.5% |
| Race/ethnicity | ||||
| White | 5430 (85.5%) | 84.6% | 6251 (86.8%) | 86.9% |
| Asian/Pacific Islander | 348 (5.5%) | 4.1% | 381 (5.3%) | 3.4% |
| Black/African American | 255 (4.0%) | 5.9% | 275 (3.8%) | 5.6% |
| Hispanic | 161 (2.5%) | 2.9% | 179 (2.5%) | 2.9% |
| Other/Unknown | 159 (2.5%) | 2.5% | 120 (1.7%) | 1.2% |
| Comorbid conditions | ||||
| Prior ischemic stroke | 366 (5.8%) | 5.0% | 886 (12.3%) | 9.8% |
| Diabetes mellitus | 930 (14.6%) | 17.0% | 1305 (18.1%) | 22.4% |
| Coronary artery disease | 1716 (27.0%) | 28.3% | 2210 (30.7%) | 32.9% |
| Peripheral artery disease | 131 (2.1%) | 2.9% | 190 (2.6%) | 4.0% |
| Hypertension | 3147 (49.5%) | 56.1% | 3760 (52.2%) | 60.8% |
| Chronic heart failure | 1658 (26.1%) | 26.1% | 2494 (34.6%) | 37.5% |
| Significant kidney dysfunction | 926 (14.6%) | 14.6% | 949 (13.2%) | 14.7% |
| Proteinuria | 782 (12.3%) | 15.0% | 901 (12.5%) | 17.1% |
PY = person-years