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. Author manuscript; available in PMC: 2020 Feb 10.
Published in final edited form as: Ann N Y Acad Sci. 2015 Mar;1338:1–15. doi: 10.1111/nyas.12723

Table 2.

Annual stroke risk in patients with atrial fibrillation using the CHADS2 score15

CHADS2 score Stroke risk % 95% CI
0 1.9 1.2–3.0
1 2.8 2.0–3.8
2 4.0 3.1–5.1
3 5.9 4.6–7.3
4 8.5 6.3–11.1
5 12.5 8.2–17.5
6 18.2 10.5–27.4

CI, confidence interval.