Table 1.

Demographic characteristics of the study population

Variable	Cases (n = 139)	Controls (n = 130)	P*
Age, mean (SE), y	58.4 (0.41)	60.9 (0.32)	<0.001
Sex, n (%)
Men	97 (69.8)	93 (71.5)
Women	42 (30.2)	37 (28.5)	0.75
Family history of cancer, n (%)
No	106 (76.3)	101 (77.7)
Yes	33 (23.7)	29 (22.3)	0.78
History of alcohol use, n (%)
Yes	91 (65.5)	65 (50.0)
No	47 (34.5)	59 (45.4)	0.003
Cigarette smoking, mean (SE)
No. years smoked	42.1 (0.5)	37.7 (9.6)	<0.001
No. cigarettes smoked per day	30.2 (1.38)	29.2 (1.21)	0.651

NOTE: All study subjects were self-reported Caucasians and current smokers.

^*P values were derived from the χ² test for categorical variables and Student’s t test for continuous variables. All P values are two-sided.