Table 1.

Characteristic of the study subjects at recruitment

	Cases (n=309)		Controls (n=535)
Characteristic	n	%	n	%	P
Sex
Male	139	45.0	210	39.3	0.103
Female	170	55.0	325	60.7
Age, years
≤ 50	117	37.9	235	43.9	0.096
>50	192	62.1	300	56.1
Race/ethnicity
Non-Hispanic white	266	86.1	453	84.7	0.578
Hispanic	43	13.9	82	15.3
Smoking
Never	169	55.0	290	54.5	0.822
Ever	96	31.3	161	30.3
Current	42	13.7	81	15.2
Alcohol drinking status
Never	141	46.1	219	41.2	0.371
Ever	44	14.4	80	15.0
Current	121	39.5	233	43.8
Radiotherapy history
Yes	8	2.6	3	0.6	0.013
No	298	97.4	524	99.4
First-degree family history of cancera
Yes	170	55.4	343	64.5	0.009
No	137	44.6	189	35.5
Body mass indexb
Normal weight or underweight	77	25.9	226	44.9	<0.001
Overweight	112	37.7	184	36.6
Obese	108	36.4	93	18.5
Histological type
Adenoid cystic carcinoma	106	34.3
Mucoepidermoid carcinoma	66	21.4
Adenocarcinoma or salivary duct carcinoma	37	12.0
Acinic cell carcinoma	36	11.6
Other	64	20.7

^aDefined as having first-degree relatives with any types of cancer.

^bCategorized as underweight or normal weight (<25.0 kg/m²), overweight (25.0-29.9 kg/m²), or obese (≥30 kg/m²) according to the World Health Organization definition.