Table 3.

Baseline characteristics in patients stratified by bleeding risk (risk score and physician-assigned).

	ATRIA ≤3 (n=7440)	MD Low Risk (n=5982)	ATRIA = 4 (n=905)	MD Intermediat e Risk (n=3393)	ATRIA ≥5 (n=1749)	MD High Risk (n=719)
Age (year)	73.5 (65-81)	73 (64-80)	68 (63-72)	78 (71-83)	82 (78-86)	78 (71-84)
Female	40	41	44	44	51	48
Race
White	90	88	82	91	90	89
Black or African American	4.4	5.5	11	4.2	4.6	4.9
Hispanic	4.2	4.8	5.2	3.2	3.7	4.2
Other	1.4	1.4	1.4	1.3	1.4	1.8
Hypertension	80	80	99	87	88	87
Diabetes	27	27	40	33	33	37
Prior GI Bleed	5.6	6.1	15	11	20	22
Anemia	0.9	14	54	23	73	32
Liver Disease	1.8	1.8	3.2	1.8	1.8	3.5
Alcohol Abuse	4.4	3.9	5.2	3.9	2.1	6
Estimated GFR (mL/min/1.73 m²)	69 (56-85)	70 (56-85)	65 (49-79)	64 (50-79)	52 (35-69)	60 (43-74)
Hemoglobin (g/dL)	13.8 (12.7-14.8)	13.7 (12.5-14.8)	12.6 (11.2-13.8)	13.3 (12-14.4)	12 (10.9-13.1)	12.8 (11.4-14.1)
Type of AF
New Onset	4.8	5.6	5.4	3.6	3.9	2.4
Paroxysmal	52	52	49	48	47	48
Persistent	17	16	18	17	15	21
Longstanding Persistent	26	26	28	31	34	28
Oral Anticoagulation
None	23	27	26	17	27	32
Warfarin	72	68	69	78	71	65
Dabigatran	5.3	5.2	5.2	4.7	2.7	2.8
CHADS₂ Risk Score, mean (SD)	2.12(1.27)	2.03(1.24)	2.19(1.13)	2.6(1.25)	2.99(1.2)	2.87(1.31)
ATRIA Score
Low (0-3)	100	78	0	69	0	58
Intermediate (4)	0	8.8	100	8.8	0	11
High (5 or more)	0	13	0	22	100	30
Site Provider
Cardiology	64	67	70	65	69	54
Electrophysiology	17	14	12	14	10	28
Primary Care Specialty	20	19	18	21	20	18

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

GI: gastrointestinal; GFR: glomerular filtration rate; AF: atrial fibrillation; SD: standard deviation.