Table 1.

Demographics

		All Patients		Asymptomatic		Symptomatic
Variable		n	%	n	%	n	%	P Value
Sex	F	14562	40.9	8374	41.9	6188	39.5
	M	21 062	59.1	11592	58.1	9470	60.5	<0.05
COPD	No	31 933	89.5	17978	89.8	13955	89.0
	Yes	3765	10.5	2037	10.2	1728	11.0	<0.05
Myocardial infarction	No	35167	98.5	19723	98.5	15444	98.5
	Yes	531	1.5	292	1.5	239	1.5	0.61
Angina	No	34762	97.4	19503	97.4	15259	97.3
	Yes	936	2.6	512	2.6	424	2.7	0.39
Peripheral Vascular disease	No	32255	90.4	17950	89.7	14305	91.2
	Yes	3443	9.6	2065	10.3	1378	8.8	<0.05
TIA	No	25801	72.3	20015	100.0	5786	36.9
	Yes	9897	27.7	0	0.0	9897	63.1	NA
Stroke	No	30213	84.6	20015	100.0	10198	65.0
	Yes	5485	15.4	0	0.0	5485	35.0	NA
Stroke-no residual symptoms	No	32420	90.8	20015	100.0	12405	79.1
	Yes	3278	9.2	0	0.0	3278	20.9	NA
Alcohol consumption	No	34149	95.7	19171	95.8	14978	95.5
	Yes	1549	4.3	844	4.2	705	4.5	0.20
Congestive heart failure	No	35330	99.0	19836	99.1	15494	98.8
	Yes	368	1.0	179	0.9	189	1.2	<0.05
Percutaneous coronary angioplasty	No	29029	81.3	16042	80.1	12987	82.8
	Yes	6669	18.7	3973	19.9	2696	17.2	<0.05
Coronary artery bypass grafting	No	27560	77.2	15160	75.7	12400	79.1
	Yes	8138	22.8	4855	24.3	3283	20.9	<0.05
Hypertension	No	5227	14.6	2883	14.4	2344	14.9
	Yes	30471	85.4	17132	85.6	13339	85.1	0.15
Bleeding disorder	No	28374	79.5	17139	85.6	11235	71.6
	Yes	7324	20.5	2876	14.4	4448	28.4	<0.05
Smoker	No	10264	38.7	5790	38.7	4474	38.6
	Yes	16286	61.3	9168	61.3	7118	61.4	0.85
Diabetes mellitus	No	25770	72.2	14513	72.5	11257	71.8
	Yes	9928	27.8	5502	27.5	4426	28.2	0.13
Dialysis	No	35337	99.0	19823	99.0	15514	98.9
	Yes	361	1.0	192	1.0	169	1.1	0.27

COPD indicates chronic obstructive pulmonary disease; NA, not applicable; and TIA, transient ischemic attack.