Table 4.

—Univariate Cox and Extended Cox Models for Time to Infection

Characteristic	Hazard Ratio	95% CI	P Value
Age (continuous)	0.99	0.97-1.02	.750
Sex: male vs female	0.43	0.18-0.99	.047
ECOG performance status score ≥ 2 vs < 2	2.38	1.00-5.67	.051
Active/ex-smoker vs never smoked	1.19	0.49-2.89	.709
History of COPD	2.12	0.77-5.84	.145
History of CHF	2.63	0.61-11.39	.196
Lung cancer vs other type of cancer	1.10	0.47-2.56	.824
Preprocedure chemotherapy: yes vs no	2.60	0.88-7.67	.084
Postprocedure chemotherapy: yes vs no	1.27	0.49-3.32	.620
Preprocedure radiation therapy: yes vs no	1.51	0.64-3.59	.347
Postprocedure radiation therapy: yes vs no	1.43	0.63-3.25	.392
Obstruction ≥ 50% preprocedure	3.27	1.20-8.92	.02
Obstruction immediately postprocedure ≥ 50%	1.68	0.39-7.29	.49
Restenosis by tumor present (time varying)	2.07	0.69-6.22	.197
Stent present (time varying)	3.54	1.51-8.31	.004

CHF = congestive heart failure; ECOG = Eastern Cooperative Oncology Group.