Table 2. Univariate and multivariate analyses for CC patients aged ≥80.

Characteristic		Univariate analysis		Multivariate analysis
		HR [95% CI]	P	HR [95% CI]	P
Node examined	<9	1	<0.001	1	<0.001
	≥9	0.797 [0.764–0.832]		0.766 [0.733–0.800]
Gender	Female	1	<0.001	1	<0.001
	Male	1.150 [1.101–1.202]		1.173 [1.122–1.226]
Race	White	1	<0.001	1	<0.001
	Black	1.140 [1.048–1.240]		1.145 [1.052–1.246]
	Others	0.749 [0.675–0.832]		0.726 [0.654–0.806]
AJCC stage	Stage I	1	<0.001	1	<0.001
	Stage II	1.250 [1.178–1.327]		1.124 [1.016–1.249]
	Stage III	1.983 [1.868–2.106]		1.353 [1.185–1.545]
T stage	T1/T2	1	<0.001	1	<0.001
	T3/T4	1.480 [1.405–1.558]		1.532 [1.348–1.742]
N stage	N0	1	<0.001	1	<0.001
	N1/N2	1.710 [1.636–1.787]		1.743 [1.678–1.797]
Tumor location	Right-sided colon	1	0.123
	Left-sided colon	1.053 [0.986–1.124]
Histological type	Adenocarcinoma	1	0.143
	Mucous/signet-ring cell	1.059 [0.997–1.125]
Grade	Grade I	1	<0.001	1	<0.001
	Grade II	1.067 [0.983–1.158]		1.003 [0.924–1.090]
	Grade III	1.336 [1.223–1.460]		1.159 [1.059–1.269]
	Grade IV	1.662 [1.432–1.930]		1.442 [1.238–1.680]

Others: American Indian/AK Native, Asian/Pacific Islander.