Table 1.

Characteristics of Study Subjects

	Patients (N = 808)		Controls (N = 808)
Study Variables	N	%	N	%	P Value
Sex					0.2
Male	449	55.6	478	59.2
Female	359	44.4	330	40.8
Age, yr (mean ± SD)	61.9 ± 10		60.2 ± 10.9		0.02
<40	15	1.9	33	4.1
41–50	96	11.9	120	14.9
51–60	236	29.2	243	30.1
61–70	288	35.7	261	32.3
>70	172	21.3	151	18.7
Race/ethnicity					0.1
White	698	86.4	721	89.2
African American	53	6.6	29	3.6
Hispanic	49	6.1	52	6.4
Asian	8	1	6	0.7
Education level					0.02
≤Bachelor’s degree	505	62.5	458	56.7
>Bachelor’s degree	303	37.5	350	43.3
State of residency					0.001
Texas or surrounding states	502	62.1	585	72.4
Other state	306	37.9	223	27.6