Table 4.

OS univariate and multivariate Cox regression after PSM

Variables	OS
	Univariate	Multivariate
	P	HR (95% CI)	P
Age	<0.001		<0.001
<65		Reference
≥65		1.460 (1.215‐1.753)	<0.001
Race	0.017		0.026
White		Reference
Black		1.183 (0.877‐1.596)	0.270
Other		0.592 (0.384‐0.913)	0.018
Sex	0.003		0.006
Female		Reference
Male		1.288 (1.074‐1.545)	0.006
Grade	0.030		0.008
I		Reference
II		1.526(0.931‐2.501)	0.094
III		1.472 (0.909‐2.383)	0.116
IV		3.697(1.731‐7.896)	0.001
Pathology	0.047	0.013
Adenocarcinoma		Reference
Squamous		1.028 (0.827‐1.278)	0.805
Others		1.378 (1.103‐1.721)	0.005
T stage	<0.001		<0.001
T1		Reference
T2		1.230 (0.973‐1.555)	0.083
T3		1.973 (1.467‐2.655)	<0.001
Radiation	0.035		0.014
No		Reference
Yes		0.802 (0.672‐0.956)	0.014