Table 2.
Event rate (95% CI) of hospital admission and death due to thromboembolism* per 100 person years
| Score/risk category | 1 year’s follow-up | 5 years’ follow-up | 10 years’ follow-up |
|---|---|---|---|
| CHADS2: | |||
| 0 | 1.67 (1.47 to 1.89) | 1.28 (1.19 to 1.38) | 1.24 (1.16 to 1.33) |
| 1 | 4.75 (4.45 to 5.07) | 3.70 (3.55 to 3.86) | 3.56 (3.42 to 3.70) |
| 2 | 7.34 (6.88 to 7.82) | 5.58 (5.35 to 5.83) | 5.40 (5.18 to 5.63) |
| 3 | 15.47 (14.62 to 16.36) | 10.29 (9.87 to 10.73) | 9.89 (9.50 to 10.31) |
| 4 | 21.55 (20.03 to 23.18) | 14.00 (13.22 to 14.82) | 13.70 (12.95 to 14.48) |
| 5 | 19.71 (16.93 to 22.93) | 12.98 (11.52 to 14.63) | 12.57 (11.18 to 14.14) |
| 6 | 22.36 (14.58 to 34.30) | 16.75 (11.91 to 23.56) | 17.17 (12.33 to 23.92) |
| CHADS2: | |||
| Low risk (0) | 1.67 (1.47 to 1.89) | 1.28 (1.19 to 1.38) | 1.24 (1.16 to 1.33) |
| Intermediate risk (1) | 4.75 (4.45 to 5.07) | 3.70 (3.55 to 3.86) | 3.56 (3.42 to 3.70) |
| High risk (2-6) | 12.27 (11.84 to 12.71) | 8.30 (8.08 to 8.51) | 7.97 (7.77 to 8.17) |
| CHA2DS2-VASc: | |||
| 0 | 0.78 (0.58 to 1.04) | 0.69 (0.59 to 0.81) | 0.66 (0.57 to 0.76) |
| 1 | 2.01 (1.70 to 2.36) | 1.51 (1.37 to 1.67) | 1.45 (1.32 to 1.58) |
| 2 | 3.71 (3.36 to 4.09) | 3.01 (2.83 to 3.20) | 2.92 (2.76 to 3.09) |
| 3 | 5.92 (5.53 to 6.34) | 4.41 (4.21 to 4.61) | 4.28 (4.10 to 4.47) |
| 4 | 9.27 (8.71 to 9.86) | 6.69 (6.41 to 6.99) | 6.46 (6.20 to 6.74) |
| 5 | 15.26 (14.35 to 16.24) | 10.42 (9.95 to 10.91) | 9.97 (9.53 to 10.43) |
| 6 | 19.74 (18.21 to 21.41) | 12.85 (12.07 to 13.69) | 12.52 (11.78 to 13.31) |
| 7 | 21.50 (18.75 to 24.64) | 13.92 (12.49 to 15.51) | 13.96 (12.57 to 15.51) |
| 8 | 22.38 (16.29 to 30.76) | 14.07 (10.80 to 18.33) | 14.10 (10.90 to 18.23) |
| 9 | 23.64 (10.62 to 52.61) | 16.08 (8.04 to 32.15) | 15.89 (7.95 to 31.78) |
| CHA2DS2-VASc: | |||
| Low risk (0) | 0.78 (0.58 to 1.04) | 0.69 (0.59 to 0.81) | 0.66 (0.57 to 0.76) |
| Intermediate risk (1) | 2.01 (1.70 to 2.36) | 1.51 (1.37 to 1.67) | 1.45 (1.32 to 1.58) |
| High risk (2-9) | 8.82 (8.55 to 9.09) | 6.01 (5.88 to 6.14) | 5.72 (5.60 to 5.84) |
*Includes peripheral artery embolism, ischaemic stroke, and pulmonary embolism.