eBox Table 1. CHADS2 score and risk of stroke adapted according to Gage et al. (e3).

CHADS2 score	Patients (n = 1733)	Adjusted stroke rate (% per year) (95% confidence interval)
0	120	1.9 (1.2 to 3.0)
1	463	2.8 (2.0 to 3.8)
2	523	4.0 (3.1 to 5.1)
3	337	5.9 (4.6 to 7.3)
4	220	8.5 (6.3 to 11.1)
5	65	12.5 (8.2 to 1..5)
6	5	18.2 (10.5 to 27.4)

CHADS2: cardiac failure, hypertension, age, diabetes, stroke (doubled)