Table 3.

Univariate and multivariate survival analysis of female colon cancer patients with liver alone, lung alone, and simultaneous liver and lung metastasis.

Characteristics	Univariate analysis	Multivariate analysis
	P value	Hazard ratio	95% CI	P value
Age at diagnosis (year)	<.001			<.001
≤60		Reference
>60		1.78	1.72-1.84	<.001
Race	<.001			<.001
Black		Reference
White		0.98	0.95-1.02	0.4443
Others		0.84	0.79-0.90	<.001
Unknown		0.11	0.07-0.19	<.001
Primary site	<.001			<.001
Right colon		Reference
Left colon		0.87	0.84-0.90	<.001
Overlapping lesion		1.15	1.03-1.28	0.0154
Unknown		1.27	1.18-1.39	<.001
Histopathology type	<.001			<.001
Adenocarcinoma		Reference
Others		1.17	1.1-1.24	<.001
Pathology grade	<.001			<.001
(I) Well-differentiated		Reference
(II) Moderately		1.15	1.08-1.23	<.001
(III) Poorly differentiated		1.62	1.51-1.74	<.001
(IV) Undifferentiated		1.94	1.77-2.11	<.001
Unknown		1.17	1.09-1.26	<.001
T stage	<.001
T0-T2		Reference
T3-T4		1.93	1.85-2.01	<.001
Unknown		1.53	1.44-1.63	<.001
N stage	<.001
N0		Reference
N1		1.70	1.63-1.76	<.001
N2		3.22	3.09-3.37	<.001
Unknown		1.32	1.23-1.41	<.001
Surgery	<.001			<.001
No		Reference
Yes		0.17	0.16-0.18	<.001
Unknown		0.53	0.38-0.76	<.001
Radiotherapy	0.277
No
Yes
Chemotherapy	<.001			<.001
No		Reference
Yes		0.47	0.45-0.48	<.001
Marital status	<.001			<.001
Married		Reference
Unmarried		1.41	1.37-1.45	<.001
Unknown		1.12	1.05-1.19	0.0312
Insurance situation	<.001			<.001
Insurance		Reference
No insurance		1.10	1.02-1.20	0.0192
Unknown		0.91	0.82	0.0826
Metastasis	<.001			<.001
None		Reference
Liver only		3.24	3.11-3.38	<.001
Lung only		2.45	2.22-2.71	<.001
Liver and lung		3.56	3.34-3.80	<.001