Clinical parameter | Points | ||
Congestive heart failure (any history) | 1 | ||
Hypertension (prior history) | 1 | ||
Age ≥75 years | 1 | ||
Diabetes mellitus | 1 | ||
Secondary prevention in patients with a prior ischemic stroke or a transient ischemic attack; most experts also include patients with a systemic embolic event | 2 | ||
CHADS2 score | Events per 100 person-years* | NNT | |
Warfarin | No warfarin | ||
0 | 0.25 | 0.49 | 417 |
1 | 0.72 | 1.52 | 125 |
2 | 1.27 | 2.50 | 81 |
3 | 2.20 | 5.27 | 33 |
4 | 2.35 | 6.02 | 27 |
5 or 6 | 4.60 | 6.88 | 44 |
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