Table 1. Distribution of selected variables between colorectal cancer cases and controls.
| Cases (n = 878) | Controls (n = 884) | ||||
|---|---|---|---|---|---|
| variables | n | % | n | % | Chi-square P -value |
| Age (mean+SD) | 60.0 ± 12.9 | 60.3 ± 13.7 | 0.632 | ||
| Sex | 0.125 | ||||
| Male | 541 | 61.6 | 513 | 58.0 | |
| Female | 337 | 38.4 | 371 | 42.0 | |
| Smoking status | 0.187 | ||||
| Never | 580 | 66.1 | 610 | 69.0 | |
| Ever | 298 | 33.9 | 274 | 31.0 | |
| Drinking status | 0.222 | ||||
| Never | 636 | 72.4 | 663 | 75.0 | |
| Ever | 242 | 27.6 | 221 | 25.0 | |
| Family history of cancer | <0.001 | ||||
| No | 672 | 76.5 | 797 | 90.2 | |
| Yes | 206 | 23.5 | 87 | 9.8 | |
| Tumor site | |||||
| Colon | 459 | 52.3 | |||
| Rectum | 419 | 47.7 | |||
| Tumor grade | |||||
| Low | 62 | 7.1 | |||
| Intermediate | 677 | 77.1 | |||
| High | 139 | 15.8 | |||
| Dukes stage | |||||
| A | 61 | 7.0 | |||
| B | 392 | 44.6 | |||
| C | 321 | 36.6 | |||
| D | 104 | 11.8 | |||
SD: standard deviation.