Table 1.

Demographic and Clinical Characteristics by Race, SEER-Medicare 2002-2006.

Characteristics	AA (N = 947); n (%)	CA (N = 10,028); n (%)	p
Age at diagnosis (years)			<.0001
66-69	256 (27)	1,907 (19)
70-74	362 (38)	3,651 (36)
≥75	329 (35)	4,470 (45)
Year of radiation			.977
2002	212 (22)	2,198 (22)
2003	191 (20)	2,109 (20)
2004	178 (19)	1,863 (19)
2005	180 (19)	1,876 (19)
2006	186 (20)	1,982 (20)
Marital status			<.0001
Married	535 (56)	7,295 (73)
Not married/unknown	412 (44)	2,733 (37)
NCI combined comorbidity score			<.0001
0	478 (50)	6,327 (63)
>0	469 (50)	3,701 (37)
% census income			<.0001
0%-25% (low income)	566 (60)	2,256 (22)
26%-50% (low–medium income)	209 (22)	2,638 (26)
51%-75% (medium–high income)	122 (13)	2,567 (26)
>75% (High income)	50 (5)	2,567 (26)
% non–high school graduate in census tract			<.0001
0%-25% (low education)	550 (58)	2,157 (22)
26%-50% (low–medium education)	218 (23)	2,459 (25)
51%-75% (medium–high education)	129 (14)	2,756 (27)
>75% (high education)	50 (5)	2,656 (26)
Population density			.038
Urban	898 (95)	8,845 (88)
Rural	49 (5)	1,183 (12)
Tumor grade
I	478 (50)	4,507 (45)	.002
II	443 (47)	5,127 (51)
III/IV	26 (3)	394 (4)
Clinical stage			.399
T1/T2	516 (54)	5,607 (56)
T3/T4	431 (45)	4,421 (44)
Treatment modality			<.0001
IMRT	423 (45)	5,282 (53)
CRT	524 (55)	4,746 (47)
Geographic region			<.0001
South	252 (26)	1,604 (16)
Northeast	280 (30)	2,871 (29)
Central	272 (29)	2,108 (21)
West	143 (15)	3,445 (34)

Note. SEER = Surveillance, Epidemiology, and End Results; AA = African American; CA = Caucasian; NCI = National Cancer Institute; IMRT = intensity-modulated radiation therapy; CRT = conformal radiation therapy. SEER sites were grouped into four geographic regions for analysis.

a. Determined using the chi-square test.