Table 4. Cox regression analysis of factors associated with poor survival after lung cancer surgery.

Risk factor	Hazard ratio	95% confidence interval	Z	P
VE/VCO2 slope >40	8.28	3.39–20.23	4.64	<0.001
Preop coronary artery disease	3.34	1.33–8.37	2.58	0.010
Preop NT-pro- BNP >100 pg/mL	3.40	1.22–9.47	2.35	0.019
Postoperative pulmonary complications	2.72	1.16–6.35	2.31	0.021