Table 2.
—Distribution of Patients According to the Different Stroke Risk Stratification Schemes
| Stroke Risk Stratification Scheme | Low Risk | Moderate Risk | High Risk |
| AFI | 127 (3.8) | 454 (13.7) | 2,721 (82.5) |
| CHADS2 (classic) | 301 (9.1) | 2,440 (73.9) | 561 (17.0) |
| CHADS2 (revised) | 301 (9.1) | 1,158 (35.1) | 1,843 (55.8) |
| Rietbrock et al12 (modified CHADS2) | 0 (0.0) | 2,598 (78.7) | 704 (21.3) |
| NICE | 120 (3.6) | 1,720 (52.1) | 1,462 (44.3) |
| ACC/AHA/ESC 2006 | 301 (9.1) | 1,158 (35.1) | 1,843 (55.8) |
| ACCP 2008 | 301 (9.1) | 1,158 (35.1) | 1,843 (55.8) |
Data are presented as No. (%). ACC/AHA/ESC = American College of Cardiology/American Heart Association/European Society of Cardiology; ACCP = ACCP Conference on Antithrombotic and Thrombolytic Therapy; AFI = Atrial Fibrillation Investigators; CHADS2 = congestive heart failure, hypertension, age ≥ 75 y, diabetes, previous stroke or transient ischemic attack; NICE = National Institute for Health and Clinical Excellence.