Table 1.

Patient characteristics

	% Cases (n = 44)	% Controls (n = 86)	p-value
Age in yrs, median	56	56	Matched by design
Range	39–78	33–82
Sex
Male	80	80	Matched by design
Female	20	20
Subsite			Matched by design
Mesopharynx	79	78
Hypopharynx	21	22
AJCC stage
IV	100	100	Matched by design
T stage			0.20
T1	7	6
T2	27	11
T3	23	35
T4	43	49
Nodal status			0.70
N0	2	1
N1	7	6
N2a	7	6
N2b	39	44
N2c	43	41
N3	2	2
Grading			0.83
G2	55	63
G2-3	7	8
G3	27	28
Missing	11	1
Chemotherapy			<0.001
Yes	100	79
No	0	21