TABLE 2.
Annual Unadjusted Incidence Rates of Thromboembolism Among Men and Women With Atrial Fibrillation Not Taking Warfarin Stratified by Known Risk Factors for Stroke and CHADS2 Score*
| Risk Factor | Annual Thromboembolism Rate (95% CI)
|
|
|---|---|---|
| Women | Men | |
| Age ≥75 y | 5.0 (4.3–5.7) | 2.8 (2.3–3.4) |
| Prior ischemic stroke | 9.7 (7.0–13.6) | 7.3 (5.2–10.3) |
| Diagnosed hypertension | 4.0 (3.4–4.7) | 2.4 (2.0–3.0) |
| Diagnosed congestive heart failure | 5.7 (4.7–6.9) | 2.5 (1.9–3.2) |
| Diagnosed coronary artery disease | 4.7 (3.8–6.0) | 2.4 (1.9–3.1) |
| Diabetes mellitus | 5.0 (3.7–6.6) | 3.1 (2.3–4.2) |
| CHADS2 score | ||
| 0 | 0.6 (0.2–1.2) | 0.5 (0.3–0.9) |
| 1 | 1.8 (1.3–2.4) | 1.2 (0.9–1.7) |
| 2 | 4.4 (3.6–5.4) | 1.9 (1.4–2.6) |
| 3 | 6.1 (4.8–7.8) | 3.9 (2.8–5.3) |
| 4 | 9.1 (6.2–13.3) | 6.5 (4.2–10.0) |
| 5 | 7.7 (3.6–16.5) | 2.6 (0.8–8.1) |
| 6 | 11.4 (2.5–51.9) | 16.2 (7.4–35.6) |
*
CHADS2 score calculated by assigning 2 points to prior stroke or transient ischemic attack and 1 point to any of the following risk factors: congestive heart failure, hypertension, age ≥75 years, and diabetes mellitus.