Table 2.

Demographic and clinical features of patients with and without metastases

Features	Lung Metastasis		P value	Liver Metastasis		P value	Bone Metastasis		P value	Brain Metastasis		P value
	No	Yes		No	Yes		No	Yes		No	Yes
Gender			0.024			0.999			0.618			0.600
Male	1386	66		1436	16		1436	16		1446	6
Female	322	6		325	3		326	2		328	0
Age			0.558			0.764			0.865			0.969
≤64	865	39		895	9		894	10		901	3
>64	843	33		866	10		868	8		873	3
Race			0.013			0.327			0.767			0.034
Caucasian	1332	46		1366	12		1365	13		1376	2
Asian	111	6		115	2		116	1		116	1
African American	265	20		280	5		281	4		282	3
Grade			0.001			0.191			0.615			0.149
1	87	1		88	0		88	0		88	0
2	885	24		902	7		899	10		908	1
3	736	47		771	12		775	8		778	5
T classification			0.004			0.280			<0.001			0.010
T1	196	1		195	2		195	2		197	0
T2	595	24		611	8		616	3		618	1
T3	442	17		457	2		457	2		457	2
T4a	325	16		338	3		337	4		341	0
T4b	150	14		160	4		157	7		161	3
N classification			<0.001			0.221			0.019			0.211
N0	601	5		602	4		604	2		606	0
N1	295	14		306	3		301	8		308	1
N2a	74	2		75	1		76	0		76	0
N2b	402	26		424	4		425	3		424	4
N2c	265	17		278	4		279	3		281	1
N3	71	8		76	3		77	2		79	0
Tumor location			0.271			0.041			0.629			0.884
Pyriform sinus	853	36		886	3		881	8		885	4
Postcricoid region	62	1		62	1		62	1		63	0
Aryepiglottic fold, hypopharyngeal	139	2		138	3		141	0		141	0
Posterior wall of hypopharynx	130	4		131	3		132	2		134	0
Overlapping lesion of hypopharynx	54	4		56	2		58	0		58	0
Hypopharynx, NOS	470	25		488	7		488	7		493	2

Abbreviations: NOS: not otherwise specified