Table 1.

Frequency distribution of demographic variables and putative risk factors for kidney cancer

Cases, n (%)Controls, n (%)
Total1,0971,555
Country
    Romania95 (9)178 (11)
    Poland99 (9)200 (13)
    Russia317 (29)468 (30)
    Czech Republic586 (53)709 (46)
Sex
    Female449 (41)543 (34)
    Male648 (59)1,012 (65)
Age at interview
    ≤4049 (4)60 (4)
    41-50163 (15)232 (15)
    51-60350 (32)501 (32)
    61-70351 (32)492 (32)
    >70184 (17)270 (17)
Smoking
    Never510 (47)628 (40)
    Former251 (23)378 (25)
    Current333 (30)543 (35)
Education
    Low344 (31)380 (25)
    Medium630 (58)1040 (67)
    High118 (11)131 (8)
Body mass index (kg/m2)
    <2023 (2)47 (3)
    20-25307 (28)514 (33)
    26 to <30473 (43)648 (42)
    >30293 (27)339 (22)
Hypertension
    No600 (55)951 (61)
    Yes496 (45)603 (39)