Table 2.

Baseline characteristics in patients stratified by empirical risk score and physician-risk categories.

	CHADS₂ = 0 (n=644)	MD Low Risk (n=4173)	CHADS₂ = 1 (n=2199)	MD Intermediate Risk (n=4296)	CHADS₂ ≥2 (n=7251)	MD High Risk (n=1625)
Age (years)	63 (54-69)	71 (63-79)	68 (61-73)	76 (69-82)	78 (71-83)	78 (71-84)
Female	33	40	36	43	45	45
Race
White	91	90	89	89	89	89
Black or African American	3.4	5.7	5	4.6	5.2	4.4
Hispanic	3.3	3	4.3	5.3	4.3	4.3
Other	1.9	1.2	1.7	1.3	1.3	2.3
Hypertension	0	77	73	87	93	89
Hyperlipidemia	43	67	66	74	76	79
Diabetes	0	22	3.2	31	40	45
History of CAD	14	29	22	38	42	48
Prior stroke/TIA	0	7.6	0	14	21	37
Congestive Heart Failure
No CHF	100	77	93	66	57	48
NYHA Class I	0	10	3	9.7	13	12
NYHA Class II	0	9.1	2.4	16	20	26
NYHA Class III/IV	0	3.9	1.2	8.1	9.6	13
LVEF Type
Normal (≥50%)	81	72	77	70	67	65
Mild dysfunction (40-50%)	3.4	5.9	4.7	6.4	6.9	6.7
Moderate dysfunction (30%-40%)	2.5	6.8	3.6	9.2	11	13
Severe dysfunction (<30%)	0	2.5	1.5	4.9	5.4	6.7
Type of AF
New Onset	6.8	5.8	6.4	4.3	4.0	3.0
Paroxysmal	68	54	55	49	48	45
Persistent	13	16	18	17	17	19
Longstanding persistent	12	24	20	30	32	33
Rhythm Control Strategy at Baseline	47	36	39	30	28	27
Oral Anticoagulation
None	48	30	30	20	20	19
Warfarin	45	65	64	75	76	77
Dabigatran	6.2	4.8	6.6	5.3	4.2	3.8
CHADS₂ Risk Score, mean (SD)	0 (0)	1.79 (1.2)	1 (0)	2.38 (1.14)	2.87 (1)	3.26 (1.27)
ATRIA Score (0-3, 4, ≥5)
Low (0-3)	99.7	78	82	72	69	67
Intermediate (4)	0.16	9.2	13	9	8.5	8.4
High (5 or more)	0.16	13	5.2	19	23	25
Site Provider
Cardiology	58	65	65	66	66	65
Electrophysiology	24	13	17	15	14	20
Primary Care Specialty	18	22	18	19	20	15

Values are presented as % or median (interquartile range), except where noted.

CAD: coronary artery disease; TIA: transient ischemic attach; LVEF: left-ventricular ejection fraction; AF: atrial fibrillation; SD: standard deviation.