Table 2. Proportion of colorectal cancer-related risk factors in each anatomic site subgroup.
| Variables | n (%) | P | ||
| Proximal colon cancer
(N=4,220) |
Distal colon cancer
(N=5,559) |
Rectal cancer
(N=10,960) |
||
| Cholecystectomy history | 0.009 | |||
| No | 4,087 (96.8) | 5,422 (97.5) | 10,710 (97.7) | |
| Yes | 133 (3.2) | 137 (2.5) | 250 (2.3) | |
| Gallstone/gallbladder polyp | <0.001 | |||
| No | 3,998 (94.7) | 5,350 (96.2) | 10,695 (97.6) | |
| Yes | 222 (5.3) | 209 (3.8) | 265 (2.4) | |
| Appendectomy history | <0.001 | |||
| No | 4,007 (94.9) | 5,325 (95.8) | 10,613 (96.8) | |
| Yes | 213 (5.1) | 234 (4.2) | 347 (3.2) | |
| Diabetes mellitus | <0.001 | |||
| No | 3,648 (86.5) | 4,754 (85.5) | 9,548 (87.1) | |
| Yes | 572 (13.5) | 805 (14.5) | 1,412 (12.9) | |
| Hypertension | <0.001 | |||
| No | 2,938 (69.6) | 3,828 (68.9) | 8,116 (74.1) | |
| Yes | 1,282 (30.4) | 1,731 (31.1) | 2,844 (25.9) | |