|
Characteristics
|
Patients (n = 380)
|
Controlsa (n = 335)
|
P valueb
|
|---|
|
No.
|
%
|
No.
|
%
|
|---|
|
Age (years)
| | | | |
0.526
|
|
<40
|
32
|
8.4
|
27
|
8.1
| |
|
41–55
|
142
|
37.4
|
109
|
32.5
| |
|
56–70
|
159
|
41.8
|
157
|
46.9
| |
|
>70
|
47
|
12.4
|
42
|
12.5
| |
|
Sex
| | | | |
0.100
|
|
Male
|
285
|
75.0
|
269
|
80.3
| |
|
Female
|
95
|
25.0
|
66
|
19.7
| |
|
Ethnicity
| | | | | |
|
Non-Hispanic white
|
380
|
100.0
|
335
|
100.0
| |
|
Tobacco smoking
| | | | |
0.588
|
|
Ever
|
278
|
73.2
|
239
|
71.3
| |
|
Never
|
102
|
26.8
|
96
|
28.7
| |
|
Alcohol drinking
| | | | | |
|
Ever
|
296
|
77.9
|
240
|
71.6
|
0.054
|
|
Never
|
84
|
22.1
|
95
|
28.4
| |
|
Tumor site
| | | | | |
|
Oropharyngeal
|
187
|
49.2
| | | |
|
Non-Oropharyngeal
|
193
|
50.8
| | | |
-
a The controls were frequency matched to the patients on the factors shown in this table.
-
b Two-sided χ
2 test.
