Table 3.

Crude Case‐Fatality in the 30 Days Following Atrial Fibrillation According to CHADS2 Score

	CHADS2	People At Risk	Deaths	Case‐Fatality (%)	95% CI
Overall	0	49 214	1496	3.04	2.89 to 3.19
	1	67 100	4413	6.58	6.39 to 6.76
	2	68 445	6755	9.87	9.65 to 10.09
	3	37 590	5671	15.09	14.72 to 15.45
	4	15 454	2756	17.83	17.23 to 18.44
	5	4780	908	19.00	17.88 to 20.11
	6	1217	326	26.79	24.30 to 29.28
Outpatient NVAF diagnosis	0	37 533	304	0.81	0.72 to 0.90
	1	42 276	968	2.29	2.15 to 2.43
	2	33 084	878	2.65	2.48 to 2.83
	3	11 152	420	3.77	3.41 to 4.12
	4	3567	140	3.92	3.29 to 4.56
	5	928	34	3.66	2.46 to 4.87
	6	165	14	8.48	4.23 to 12.74
Hospital NVAF diagnosis	0	11 681	1192	10.20	9.66 to 10.75
	1	24 824	3445	13.88	13.45 to 14.31
	2	35 361	5877	16.62	16.23 to 17.01
	3	26 438	5251	19.86	19.38 to 20.34
	4	11 887	2616	22.01	21.26 to 22.75
	5	3852	874	22.69	21.37 to 24.01
	6	1052	312	29.66	26.90 to 32.42
Primary diagnosis	0	2454	25	1.02	0.62 to 1.42
	1	3888	84	2.16	1.70 to 2.62
	2	4489	150	3.34	2.82 to 3.87
	3	2753	146	5.30	4.47 to 6.14
	4	969	62	6.40	4.86 to 7.94
	5	255	17	6.67	3.60 to 9.73
	6	61	10	16.39	7.10 to 25.68
Secondary diagnosis	0	9227	1167	12.65	11.97 to 13.33
	1	20 936	3361	16.05	15.56 to 16.55
	2	30 872	5727	18.55	18.12 to 18.98
	3	23 685	5105	21.55	21.03 to 22.08
	4	10 918	2554	23.39	22.60 to 24.19
	5	3597	857	23.83	22.43 to 25.22
	6	991	302	30.47	27.61 to 33.34

CI indicates confidence intervals.