Table 1.

Frequency distributions of selected variables in SCCHN cases and cancer-free controls

VariablesCases (n = 721), n (%)Controls (n = 1,234), n (%)P*
Age (y)
    ≤45105 (14.6)195 (15.8)0.277
    46-55227 (31.5)345 (28.0)
    56-65220 (30.5)370 (30.0)
    >65169 (23.4)324 (26.2)
Sex
    Female181 (25.1)320 (25.9)0.686
    Male540 (74.9)914 (74.1)
Smoking status
    Never188 (26.1)371 (30.1)<0.001
    Former282 (39.1)549 (44.5)
    Current251 (34.8)314 (25.4)
Alcohol use
    Never157 (21.8)373 (30.2)<0.001
    Former195 (27.0)322 (26.1)
    Current369 (51.2)539 (43.7)
  • * Two-sided χ2 test.