Table 1 Distribution of selected variables in SCCHN cases and cancer-free controls
Variables | Cases No. (%) | Controls No. (%) | P a |
|---|---|---|---|
All subjects | 1,098 (100%) | 1,090 (100%) | Â |
Age, yr | Â | Â | 0.676 |
≤57 (median) | 586 (53.4) | 572 (52.5) |  |
>57 (median) | 512 (46.6) | 518 (47.5) | Â |
Sex | Â | Â | 0.581 |
Females | 271 (24.7) | 258 (23.7) | Â |
Males | 827 (75.3) | 832 (76.3) | Â |
Smoking status | Â | Â | <0.001 |
Never | 305 (27.8) | 535 (49.1) | Â |
Ever | 793 (72.2) | 555 (50.9) | Â |
Alcohol status | Â | Â | <0.001 |
Never | 298 (27.1) | 473 (43.4) | Â |
Ever | 800 (72.9) | 617 (56.6) | Â |
Tumor site | Â | Â | Â |
Oropharynx | 559 (50.9) | Â | Â |
Non-oropharynx | 539 (49.1) | Â | Â |
Stage | Â | Â | Â |
I-II | 272 (24.8) | Â | Â |
III-IV | 826 (75.2) | Â | Â |