Table 1. Patient, tumor and treatment characteristics and their effects on time to treatment (univariate analysis).

Characteristic		No. of Patients	Time to Treatment (days)	Range (days)	P value
Age	Median	65 years
	Range	34 – 89 years			0.027‡
	34-65 years	121 (51.1%)	55.0	0 - 223
	>65 years	116 (48.9%)	62.0	9 - 377
Gender					0.013‡
	Male	170 (71.7%)	60.0	0 - 377
	Female	67 (28.3%)	54.0	1 - 223
KPS	Median	80
	Range	60 – 100			0.002‡
	< 80	11 (4.6%)	60.0	7 - 147
	≥ 80	226 (95.4%)	57.0	0 - 377
Weight loss					0.368‡
≥ 5%	Yes	85 (35.9%)	53.0	6 – 377
	No	152 (64.1%)	60.0	0 - 324
Smoking					0.656‡
history	Yes	211 (89.0%)	56.0	0 - 377
	No	26 (11.0%)	67.0	9 - 186
Oxygen use					0.171‡
pre-RT			46.0	14 -
	Yes	19 (8.0%)		147
	No	218 (92.0%)	58.0	0 - 377
Comorbidity	Median	2.0
score	Range	0-10			0.087‡
	0 - 2.0	152 (64.1%)	54.0	6 - 377
	> 2	85 (35.9)	64.0	0 - 265
Hospital					0.001‡
	UM	154 (65.0%)	55.0	1.0 -265
	VA	83 (35.0%)	67.0	0 - 377
Treatment					0.747†
regimen	RT	106 (44.7%)	54.0	0 - 336
	SCTRT	69 (29.1%)	56.0	1 - 194
	CTRT	62 (26.2%)	59.0	9 - 377

Abbreviations: KPS = Karnofsky performance score, UM = University of Michigan Hospital, VA = Veterans Affairs Ann Arbor Healthcare System, RT= Radiotherapy, SCTRT = Sequential chemoradiation, CTRT = Concurrent chemoradiation

^†Log-rank test, categorical covariates or continuous covariate transform to categorical covariates by the median.

^‡Cox-regression analysis, continuous covariate.