Table 2.

Univariate analyses of cancer special survival (CSS) and overall survival (OS) for patients.

Variables	CSS		OS
	χ2	P-value	χ2	P-value
Year at diagnosis	1.792	0.408	0.425	0.809
2004–2007
2008–2011
2012–2015
Insured status	0.100	0.752	0.042	0.838
Uninsured/unknown
Medicaid/insured
Age	3.228	0.072	48.231	< 0.001
< 65
≥ 65
Marital status	3.833	0.050	11.387	0.001
Unmarried
Married
Gender	1.064	0.302	0.253	0.615
Female
Male
Race	6.898	0.032	4.279	0.118
Black
White
Other
Primary site	28.228	< 0.001	17.909	< 0.001
Cecum–transverse colon
Descending colon–sigmoid
Multiple
Rectum
Unknown
Grade	12.475	0.002	10.475	0.005
Grade I/II
Grade III/IV
Unknown
Tumor size	17.228	< 0.001	10.149	0.006
≤ 5 cm
> 5 cm
Unknown
AJCC stage	117.678	< 0.001	73.305	< 0.001
II
III
Lymph node dissection	45.345	< 0.001	49.265	< 0.001
None or biopsy
1–3
≥ 4
Radiotherapy	14.163	< 0.001	3.347	0.067
No/unknown
Yes
Chemotherapy	0.008	0.930	22.324	< 0.001
No/unknown
Yes

CSS: cancer‐specific survival; OS: overall survival.