Table 2.

Matched Cox multivariate regression.

	HR	95% CI	p-value
Overall survival
Surgical procedure (wedge resection, segmentectomy, and lobectomy)	0.913	0.809–1.031	0.143
Age at diagnosis	1.034	1.009–1.059	0.007
Year of surgery	0.916	0.846–0.991	0.029
Gender	1.505	1.245–1.818	<0.001
Tumor grade	1.442	1.268–1.641	<0.0001
T stage	1.300	1.174–1.44	<0.0001
Number of lymph nodes harvested	0.747	0.653–0.855	<0.001
Lung cancer–specific survival
Surgical procedure	0.895	0.758–1.056	0.189
Age at diagnosis	1.033	1.000–1.067	0.047
Year of surgery	0.912	0.823–1.010	0.077
Gender	1.503	1.163–1.943	0.002
Tumor grade	1.759	1.471–2.103	<0.001
T stage	1.334	1.162–1.532	<0.001
Number of lymph nodes harvested	0.672	0.560–0.806	<0.001