Table 1.

Characteristics of incident CRC cases, California 1998-2002

	Total CRC (n = 52,608) n (%)	Right-sided colon cancer (n = 20,560) n (%)	Left-sided colon cancer (n = 14,969) n (%)	Rectal cance (n = 14,828) N (%)
Age group
50–59 years	9,141 (17.4)	2,528 (12.3)	2,908 (19.4)	3,467 (23.4)
60–69 years	12,944 (24.6)	4,464 (21.7)	3,989 (26.6)	4,116 (27.8)
70–79 years	17,024 (32.4)	7,089 (34.5)	4,853 (32.4)	4,468 (30.1)
80+ years	13,499 (25.7)	6,479 (31.5)	3,219 (21.5)	2,777 (18.7)
Male	26,681 (50.7)	9,179 (44.6)	8,067 (53.9)	8,399 (56.6)
Female	25,927 (49.3)	11,381 (55.4)	6,902 (46.1)	6,429 (43.4)
Race/ethnicity
Non-Hispanic White	37,407 (71.1)	15,247 (74.2)	10,204 (68.2)	10,293 (69.4)
African American	3,475 (6.6)	1,505 (7.3)	1,039 (6.9)	756 (5.1)
Hispanic	6,427 (12.2)	2,257 (11.0)	1,856 (12.4)	2,050 (13.8)
Asian/Pacific Islander	5,299 (10.1)	1,551 (7.5)	1,870 (12.5)	1,729 (11.7)
Tumor stage
Localized	17,482 (33.2)	5,983 (29.1)	5,561 (37.2)	5,835 (39.4)
Regional/metastasized	29,147 (55.4)	12,777 (62.1)	8,167 (54.6)	7,264 (49.0)
Unknown	5,958 (11.3)	1,800 (8.8)	1,241 (8.3)	1,729 (11.7)
Tumor grade
Well differentiated	4,691 (8.9)	1,691 (8.2)	1,653 (11.0)	1,290 (8.7)
Moderately differentiated	30,853 (58.6)	11,983 (58.3)	9,540 (63.7)	9,007 (60.7)
Poorly differentiated	8,846 (16.8)	4,709 (22.9)	1,929 (12.9)	2,037 (13.7)
Unknown	8,218 (15.6)	2,177 (10.6)	1,847 (12.3)	2,494 (16.8)
SES quintile
Q1 (lowest)	7,226 (13.7)	2,632 (12.8)	2,170 (14.5)	2,092 (14.1)
Q2	10,624 (20.2)	3,997 (19.4)	3,032 (20.3)	3,065 (20.7)
Q3	11,414 (21.7)	4,423 (21.5)	3,187 (21.3)	3,298 (22.2)
Q4	11,814 (22.5)	4,803 (23.4)	3,236 (21.6)	3,299 (22.2)
Q5 (highest)	11,530 (21.9)	4,705 (22.9)	3,344 (22.3)	3,074 (20.7)