Table 2.

Demographic characteristics of 8967 cases and 13627 controls included in the pooled analysis

Demographic characteristics	Cases	(%)	Controls	(%)
Age
<40	323	3.6	892	6.6
40-<45	533	5.9	1039	7.6
45-<50	1012	11.3	1587	11.7
50-<55	1415	15.8	2181	16.0
55-<60	1665	18.6	2353	17.3
60-<65	1480	16.5	2088	15.3
65-<70	1243	13.9	1734	12.7
70-<75	837	9.3	1232	9.0
>=75	459	5.1	521	3.8
Sex
Men	7248	80.8	9794	71.9
Women	1719	19.2	3833	28.1
Χ2 test	<0.0001b
Race/Ethnicity			1
Non hispanic white	5560	62.0	10332	75.8
Black	341	3.8	454	3.3
Hispanic/Latino	141	1.6	329	2.4
Asian/Pacific islanders	616	6.9	654	4.8
Latin Americans	2191	24.4	1706	12.5
Others	118	1.3	152	1.1
Χ2 test	<0.0001
Education
None	446	5.0	304	2.2
<Junior high school	4383	48.9	6240	45.8
Some high school	1126	12.6	1521	11.2
High school graduate	1022	11.4	1502	11.0
Vocational, some college	831	9.3	1758	12.9
>=College	833	9.3	2051	15.1
Missing	326	3.6	251	1.8
Χ2 test	<0.0001
Tobacco smoking
Never#	913	10.2	5298	38.9
ever	8051	89.8	8320	61.1
Missing	3		9
Χ2 test	<0.0001
Packyears
non cigarette smokers	1322	14.9	5489	40.8
1-10 py	632	7.1	2032	15.1
11-20 py	910	10.3	1607	11.9
21-30 py	1270	14.3	1358	10.1
31-40 py	1366	15.4	1084	8.1
41-50 py	1072	12.1	722	5.4
>50 py	2300	25.9	1183	8.8
Missing	95		152
Χ2 test	<0.0001
Alcohol drinking
never	1435	16.0	3653	26.8
ever	7521	84.0	9967	73.2
Missing	11		7
Χ2 test	<0.0001
Frequency of drinking			1
never drinker	1435	16.0	3653	26.8
<1drink per day	1286	14.4	3000	22.0
1-2 drinks per day	1459	16.3	2920	21.4
3-4 drinks per day	1030	11.5	1560	11.5
5-6 drinks per day	807	9.0	784	5.8
>=7 drinks per day	2597	29.0	1343	9.9
Missing	353	3.9	367	2.7
Χ2 test	<0.0001
HNC subtype
Oral cavity	2332	26.0
Oroharynx	668	7.4
Hypopharynx	2254	25.1
Oral/Pharynx NOS	835	9.3
Larynx	2572	28.7
Overlapping HNC	306	3.4

^#Never tobacco users were subjects that never used cigarette, pipe, cigar, snuff or chew.