Table I.
Frequency distributions of selected variables in patients with CRC and cancer-free control subjects.
| Variables | No. cases (n=855) (%) | No. controls (n=871) (%) | P-value |
|---|---|---|---|
| Age (years) | 0.5773 | ||
| ≤49 | 198 (23.1) | 198 (22.7) | |
| 50-60 | 234 (27.4) | 258 (29.6) | |
| >60 | 423 (49.5) | 415 (47.7) | |
| Gender | 0.9319 | ||
| Male | 521 (60.9) | 529 (60.7) | |
| Female | 334 (39.1) | 342 (39.3) | |
| Smoking status | 0.4520 | ||
| Smoker | 414 (48.4) | 406 (46.6) | |
| Non-smoker | 441 (51.6) | 465 (53.4) | |
| Alcohol status | <0.0001 | ||
| Not teetotal | 400 (46.8) | 204 (23.4) | |
| Teetotal | 455 (53.2) | 667 (76.6) | |
| Family history of cancer | 0.0379 | ||
| Yes | 96 (11.2) | 72 (8.3) | |
| No | 759 (88.8) | 799 (91.7) | |
| BMI (kg/m2) | 0.0245 | ||
| <18 | 56 (6.5) | 35 (4.0) | |
| 18–25 | 557 (65.2) | 608 (69.8) | |
| >25 | 242 (28.3) | 228 (26.2) | |
| Menstrual history | <0.0001 | ||
| Premenopause | 65 (19.5) | 144 (42.1) | |
| Menopause | 269 (80.5) | 198 (57.9) |
P-value for a two-sided χ2 test. BMI, body mass index; CRC, colorectal cancer.