Table 5.

Stepwise Cox regression analysis on survival of lung adenocarcinoma

Variable	β	SEM	HR	95%CI	P value
stage (III+ IV vs. I+II)	0.661	0.102	1.94	1.59-2.36	< 0.001
chemotherapy or radiotherapy	-1.095	0.307	0.34	0.18-0.61	< 0.001
ERCC1 118 (CT/TT vs. CC)	0.473	0.142	1.60	1.22-2.12	0.001
XRCC1 399 (GA/AA vs. GG)	0.405	0.143	1.50	1.13-1.98	0.005

Abbreviation: SEM, Standard error of difference; HR, hazard ratio; CI, confidence interval.

β, regression coefficient.