Table 2.

Cohort Characteristics for Four Groups, by Decision Support Tool Recommendation for Anticoagulation and Actual Treatment with Warfarin

	Anticoagulation per DST					No anticoagulation per DST
	Warfarin treatment		No Warfarin treatment			Warfarin treatment		No Warfarin treatment
	n	%	n	%	p	n	%	n	%	p
Observations	298	9.9	2,710	90.1		203	6.5	2,912	93.5
Age, mean (SD)	68.6	(13.7)	74.6	(14.3)	<0.01	76.1	(10.1)	78.6	(12.1)	<0.01
White	241	80.9	2,100	77.5	0.18	175	86.2	2,354	80.8	0.06
Female	209	70.1	2,069	76.3	0.02	155	76.4	2,154	74	0.45
Hypertension	217	72.8	1,791	66.1	0.02	59	29.1	773	26.5	0.43
DM	132	44.3	1,161	42.8	0.63	22	10.8	335	11.5	0.77
CHF	167	56	1,505	55.5	0.87	39	19.2	630	21.6	0.42
Prior MI	55	18.5	478	17.6	0.73	22	10.8	336	11.5	0.76
Prior stroke	21	7	236	8.7	0.33	20	9.9	250	8.6	0.54
Recent stroke	5	1.7	42	1.5	0.87	15	7.4	168	5.8	0.34
Prior GI bleed	3	1	19	0.7	0.47*	16	7.9	402	13.8	0.02
Prior ICH	0	0	33	1.2	0.07*	0	0	26	0.9	0.41*
Prior other bleed	13	4.4	147	5.4	0.44	6	3	94	3.2	0.83
Comorbidity (any of the 3)	25	8.4	301	11.1	0.15	60	29.6	1,193	41	<0.01
Anemia	14	4.7	178	6.6	0.21	47	23.2	837	28.7	0.09
Renal disease	9	3	162	6	0.04	12	5.9	413	14.2	<0.01
Recent MI	6	2	68	2.5	0.6	9	4.4	182	6.3	0.3
Substance abuse	17	5.7	94	3.5	0.05	6	3	95	3.3	0.81
Psychiatric Dx	45	15.1	559	20.6	0.02	23	11.3	530	18.2	0.01
Social factors	50	16.8	655	24.2	<0.01	47	23.2	598	20.5	0.37
Non-compliance	97	32.6	1,151	42.5	<0.01	72	35.5	1,079	37.1	0.65
GI Med	152	51	1,528	56.4	0.08	93	45.8	1,537	52.8	0.05
Analgesics	228	76.5	1,984	73.2	0.22	157	77.3	1,897	65.1	<0.01
Steroids +	84	28.2	756	27.9	0.92	47	23.2	689	23.7	0.87
Other GI/anemia risk Rx	28	9.4	277	10.2	0.65	18	8.9	365	12.5	0.12
All cause mortality	91	30.5	1,323	48.8	<0.01	74	36.5	1,691	58.1	<0.01

p: Chi square

*Fisher’s exact