Table 4.

Univariate and multivariate analyses of prognostic factors after PSM.

Factors		Univariate analysis			Multivariate analysis
		1-year Survival	3-year Survival	p value	Risk ratio	95% CI	p value
Sex	Male	32.1%	5.4%	0.072	0.600	0.232-1.551	0.292
	Female	45.5%	25.6%
Age	≤60y	45.5%	15.8%	0.300	0.785	0.367-1.679	0.533
	>60y	23.5%	11.8%
Tumor location	Upper	35.5%	14.3%	0.252	1.383	0.357-5.361	0.639
	Middle	43.8%	16.5%
	Lower	0%	0%
SCLN position	Left side	28.6%	0%	0.180	0.693	0.224-2.144	0.525
	Right side	50.0%	19.6%
	Both sides	12.5%	12.5%
CVM	No	33.0%	21.4%	0.378	1.228	0.514-2.931	0.644
	Yes	50.0%	0%
CMF	No	40.0%	16.0%	0.858	1.008	0.504-2.014	0.982
	Yes	36.0%	9.1%
Salvage radiation	Yes	64.0%	30.2%	<0.000	3.937	1.040-14.923	0.044
	No	12.0%	0%
Salvage radiation dose	<60 Gy	40.0%	0%	<0.000	2.691	0.817-8.860	0.104
	≥60 Gy	70.0%	30.5%
	No	12.0%	0%
Salvage treatment methods	Radiochemotherapy	83.3%	16.7%	<0.000	1.528	0.607-3.846	0.368
	Radiotherapy	57.9%	35.5%
	Supportive treatment	11.8%	0%
	chomotherapy	12.5%	0%