Table 1.
Descriptive table of demographic variables
| Control* | Case** | p-value | |
|---|---|---|---|
| Agea | |||
| < 45 | 229 (45.8%) | 86 (20.5%) | < 0.001 |
| ≥ 45 | 271 (54.2%) | 333 (79.5%) | |
| Sex | |||
| Female | 261 (52.2%) | 200 (47.7%) | 0.2 |
| Male | 239 (47.8%) | 219 (52.3%) | |
| Addictionb | |||
| No | 387 (77.4%) | 353 (84.2%) | 0.0115 |
| Yes | 113 (22.6%) | 66 (15.8%) | |
| Tumor location | |||
| Colon | 206 (49.2%) | ||
| Rectosigmoid | 213 (50.8%) | ||
*Number of controls: 500; **number of cases: 419; Chi-squared test was used to determine the p-value; aa cut off of 45 years old was determined for age according to American Cancer Society Guidelines and US Preventive Services Task Force Recommendation Statement [19, 20]; btype of addiction = smoking (cigarette, hookah, opium)