TABLE III.

Cox proportional hazards model for overall survival

Variable	hr	95% cl	p Value
Smoker	1.30	0.61, 2.78	0.50
ecog ps ≥ 1	2.19	1.03, 4.66	0.04
Squamous cell histology	0.44	0.18, 1.08	0.07
N Stage 1–3	3.39	1.54, 7.49	0.002
T Stage 3/4	1.30	0.56, 3.01	0.54
mmc2 chemotherapy	0.92	0.44, 1.91	0.83

hr = hazard ratio; cl = confidence limits; ecog ps = Eastern Cooperative Oncology Group performance status; mmc2 = patient cohort receiving 2 cycles of mitomycin C with radiation.