Table 1. Distribution of Risk Factors by Prophylactic Aspirin Use.

	taking aspirin for prophylaxis
	sample szie	taking aspirin		P value
		No.	%
all	16908	5331	31.5
Region				0.0696
Other regions	7968	2457	30.8
Stroke Belt	8928	2869	32.1
Race				<0.0001
White	9755	3383	34.7
Black	7148	1947	27.2
Gender				<0.0001
Male	7366	2727	37.0
Female	9539	2604	27.3
Age group				<0.0001
45-54	1908	324	17.0
55-64	7104	2090	29.4
65-74	5416	1999	36.9
75-84	2214	829	37.4
85+	257	88	34.2
Income				<0.0001
<$20K	2883	804	27.9
$20K-$34K	4005	1199	29.9
$35K-74K	5252	1695	32.3
$75+	2747	997	36.3
Years of education				<0.0001
< high school	1952	569	29.1
high school	4315	1297	30.1
Some College	4569	1363	29.8
College+	6060	2100	34.7
Perceived health				0.5163
Excellent	3142	955	30.4
Very good	5579	1764	31.6
Good	5739	1842	32.1
Fair	2045	638	31.2
Poor	369	122	33.1
hypertension				<0.0001
No	7731	1954	25.3
Yes	9081	3347	36.9
Diabetes				<0.0001
No	13226	3949	29.9
Yes	3064	1230	40.1
Dyslipidemia				<0.0001
No	7446	1908	25.6
Yes	8826	3273	37.1
Smoke status				<0.0001
Never	7852	2360	30.1
Past	6640	2341	35.3
Current	2349	609	25.9
Alcohol use				<0.0001
Never	5024	1476	29.4
Past	2843	857	30.1
Current	9041	2998	33.2
FraminghamCardiacRiskScore				<0.0001
<Q1	4030	987	24.5
Q1-Median	4029	1301	32.3
Median-Q3	4029	1421	35.3
Q3 or higher	4030	1418	35.2
FraminghamStrokeRiskScore				<0.0001
<Q1	2461	450	18.3
Q1-Median	2462	724	29.4
Median-Q3	2463	858	34.8
Q3 or higher	2461	955	38.8

These cross-sectional associations are described in a national cohort (with oversampling of the southeastern “stroke belt”) of African American and white participants evaluated between January 2003 and August 2006.