Table 2. Risk Factors and Level of Assessed Risk Among Patients With Atrial Fibrillation in Intervention and Control Arms of a Cluster-Randomized Controlled Trial of a Computerized Antithrombotic Risk Assessment Tool for General Practitioners in New South Wales, Australia^a .

Risk Factor and Level	All Patients (N = 393)	Intervention Arm (n = 206)	Control Arm (n = 187)	P Valueb
Stroke Riskc
Risk factor
Previous stroke or transient ischemic attack	72 (18.3)	50 (24.3)	22 (11.8)	.001
Aged ≥75 y	266 (67.7)	151 (73.3)	115 (61.5)	.01
Congestive heart failure	100 (25.4)	84 (40.8)	16 (8.6)	<.001
Hypertension	268 (68.2)	166 (80.6)	102 (54.5)	<.001
Diabetes mellitus	78 (19.8)	41 (19.9)	37 (19.8)	0.98
Level of assessed risk
High	278 (70.7)	175 (85.0)	103 (55.1)	<.001
Intermediate	88 (22.4)	25 (12.1)	63 (33.7)
Low	27 (6.9)	6 (2.9)	21 (11.2)
Bleeding Risk d
Risk factor
Hepatic or renal disease	18 (4.6)	12 (5.8)	6 (3.2)	.22
Alcohol abuse	8 (2.0)	7 (3.4)	1 (0.5)	.045
Malignancy	33 (8.4)	22 (10.7)	11 (5.9)	.09
Reduced platelet count	6 (1.5)	6 (2.9)	0 (0.0)	.02
Re-bleeding risk	4 (1.0)	4 (1.9)	0 (0.0)	.06
Uncontrolled hypertension	40 (10.2)	13 (6.3)	27 (14.4)	.008
Anemia	14 (3.6)	9 (4.4)	5 (2.7)	.36
Risk of excessive falls	22 (5.6)	22 (10.7)	0 (0.0)	<.001
Previous hemorrhagic stroke	6 (1.5)	6 (2.9)	0 (0.0)	.02
Level of assessed risk
High	4 (1.0)	4 (1.9)	0 (0.0)	.03
Intermediate	10 (2.5)	8 (3.9)	2 (1.1)
Low	379 (96.4)	194 (94.2)	185 (98.9)

^a All values are number (percentage in subgroup) unless otherwise indicated.

^b P value for difference between intervention arm and control arm determined by Pearson χ² test.

^c Patients were assessed for risk of stroke according to the CHADS₂ Score for Atrial Fibrillation Stroke Risk (25).

^d Patients were assessed for risk of bleeding according to HEMORR₂HAGES criteria (26).