Table 1.

Characteristics of Cohort

	All patients		CTRT		RT
	No.	%	No.	%	No.	%	p-value
Total	2,277	-	1,502	66%	775	34%
Age at diagnosis
66–69	636	28%	478	32%	158	20%	<0.0001
70–74	661	29%	474	32%	187	24%
75–59	486	21%	314	21%	172	22%
80–84	315	14%	169	11%	146	19%
85+	179	8%	67	4%	112	14%
Sex
Male	1,713	75%	1,152	77%	561	72%	0.0240
Female	564	25%	350	23%	214	28%
Race
White	1,915	84%	1,286	86%	629	81%	0.0223
Black	244	11%	146	10%	98	13%
Other	118	5%	70	5%	48	6%
Census tract median income
1st quartile	568	25%	353	24%	215	28%	0.0545
2nd quartile	562	25%	365	24%	197	25%
3rd quartile	575	25%	386	26%	189	24%
4th quartile	572	25%	398	26%	174	22%
Urban-rural residence
Metropolitan	1,885	83%	1,263	84%	622	80%	0.0218
Non-metropolitan	392	17%	239	16%	153	20%
Region
Northeast	480	21%	335	22%	145	19%	0.0136
South	716	31%	442	29%	274	35%
Midwest	218	10%	151	10%	67	9%
West	863	38%	574	38%	289	37%
Married
Yes	1,191	52%	845	56%	346	45%	<0.0001
No	1,030	45%	624	42%	406	52%
Unknown	56	2%	33	2%	23	3%
Site
Oropharynx	966	42%	707	47%	259	33%	<0.0001
Hypopharynx	293	13%	205	14%	88	11%
Larynx	1,018	45%	590	39%	428	55%
Clinical T-stage
T1	258	11%	180	12%	78	10%	0.2997
T2	660	29%	427	28%	233	30%
T3	813	36%	546	36%	267	34%
T4	546	24%	349	23%	197	25%
Lymph node involvement
Negative	801	35%	432	29%	369	48%	<0.0001
Positive	1,477	65%	1,070	71%	407	53%
Charlson comorbidity score
0	1,223	54%	849	57%	374	48%	0.0001
1	611	27%	393	26%	218	28%
2+	443	19%	260	17%	183	24%
Year of diagnosis
2001	245	11%	118	8%	127	16%	<0.0001
2002	271	12%	141	9%	130	17%
2003	265	12%	133	9%	132	17%
2004	223	10%	138	9%	85	11%
2005	242	11%	160	11%	82	11%
2006	248	11%	183	12%	65	8%
2007	236	10%	187	12%	49	6%
2008	271	12%	217	14%	54	7%
2009	276	12%	225	15%	51	7%

Abbreviations: CTRT, chemoradiation; RT, radiation therapy