Table 1.

Demographic and clinicopathological features of patients with stage I–III colon cancers

Characteristic	All (N=8197)	RCC (N=3709)	LCC (N=4488)	P
Age group
20–29	402 (4.9)	203 (5.5)	199 (4.4)	0.001
30–39	1703 (20.8)	823 (22.2)	880 (19.6)
40–49	6092 (74.3)	2683 (72.3)	3409 (76.0)
Sex
Male	4273 (52.1)	2082 (56.1)	2191 (48.8)	<0.001
Female	3924 (47.9)	1627 (43.9)	2297 (51.2)
Race
White	5889 (71.8)	2639 (71.2)	3250 (72.4)	<0.001
Black	1269 (15.5)	681 (18.4)	588 (13.1)
Other	992 (12.1)	371 (10.0)	621 (13.8)
Unknown	47 (0.6)	18 (0.5)	29 (0.6)
Marital status
Married	5015 (61.2)	2237 (60.3)	2778 (61.9)	0.34
Widowed	83 (1.0)	37 (1.0)	46 (1.0)
Single, separated, or divorced	2775 (33.9)	1294 (34.9)	1481 (33.0)
Unknown	324 (4.0)	141 (3.8)	183 (4.1)
AJCC stage
I	1699 (20.7)	530 (14.3)	1169 (26.0)	<0.001
II	2726 (33.3)	1450 (39.1)	1276 (28.4)
III	3772 (46.0)	1729 (46.6)	2043 (45.5)
Histological type
Adenocarcinoma	7102 (86.6)	2978 (80.3)	4124 (91.9)	<0.001
Mucinous adenocarcinoma	968 (11.8)	653 (17.6)	315 (7.0)
Signet ring cell carcinoma	127 (1.5)	78 (2.1)	49 (1.1)
Grade
Well differentiated	712 (8.7)	277 (7.5)	435 (9.7)	<0.001
Moderately differentiated	5506 (67.2)	2342 (63.1)	3164 (70.5)
Poorly differentiated	1442 (17.6)	843 (22.7)	599 (13.3)
Undifferentiated	116 (1.4)	68 (1.8)	48 (1.1)
Unknown	421 (5.1)	179 (4.8)	242 (5.4)
No. of LNs examined
0–11	2447 (29.9)	740 (20.0)	1707 (38.0)	<0.001
≥12	5750 (70.1)	2969 (80.0)	2781 (62.0)
Year of diagnosis
1990–1994	1267 (15.5)	697 (16.4)	660 (14.7)	0.12
1995–1999	1456 (17.8)	672 (18.1)	784 (17.5)
2000–2004	1760 (21.5)	803 (21.7)	957 (21.3)
2005–2009	1805 (22.0)	789 (21.3)	1016 (22.6)
2010–2014	1909 (23.3)	838 (22.6)	1071 (23.9)

Note: Data are presented as n (%).

Abbreviations: RCC, right-sided colon cancer; LCC, left-sided colon cancer; AJCC, American Joint Committee on Cancer; LNs, lymph nodes.