Table 2. Demographic and pathological characteristics of patients and controls.

	Cases (n = 510)		Control (n = 510)
Variable	No.	%	No.	%	P a value
Sex					0.402
Men	321	62.9	308	60.4
Women	189	37.1	202	39.6
Age (y)					0.133
<58	240	47.1	264	51.8
≥58	270	52.9	246	48.2
Smoking status					0.017
Smoker	263	51.6	225	44.1
Nonsmoker	247	48.4	285	55.9
Stage at diagnosis
I	41	8.0
II	181	35.5
III	162	31.8
IV	25	4.9
Unknow	101	19.8
Grade at diagnose
Low	56	11.0
Intermediate	116	22.7
High	231	45.3
Unknow	107	21.0

^aTwo-side chi-square test.