Table 3.
Distribution of patients and event rates with 95% CI using bootstrap (n = 1000) for the CAS and CHA2DS2-VA scores in the China-AF cohort.
| Risk class | Proportion in the study population(n = 6601) | Event rates (95% CI) |
| CAS score | ||
| 0 | 30.8% (2033) | 0.81% (0.41%–1.19%) |
| 1 | 39.1% (2581) | 2.33% (1.78%–3.02%) |
| ≥2 | 30.1% (1987) | 5.51% (4.47%–6.71%) |
| CHA2DS2-VA score | ||
| 0 | 15.2% (1002) | 1.01% (0.36%–1.64%) |
| 1 | 19.1% (1262) | 1.24% (0.53%–1.91%) |
| ≥2 | 65.7% (4337) | 3.67% (3.08%–4.27%) |
AF: Atrial fibrillation; CAS: Congestive heart failure or left ventricular dysfunction, age, and prior stroke; China-AF: China atrial fibrillation; CI: Confidence interval.