Table 1.
Basic characteristics of included colorectal cancer patients and control subjects
| Variables | Colorectal cancer patients N = 316 (%) | Control subjects N = 316 (%) | χ2 value | P value |
|---|---|---|---|---|
| Age, years | ||||
| Average | 63.5 ± 10.9 | 62.8 ± 11.7 | ||
| < 60 | 175 (55.38) | 179 (56.65) | ||
| ≥ 60 | 141 (44.62) | 137 (43.35) | 0.11 | 0.75 |
| Sex | ||||
| Male | 122 (38.61) | 122 (38.61) | ||
| Female | 194 (61.39) | 194 (61.39) | 0.00 | 1.00 |
| Smoking status | ||||
| Never | 204 (64.56) | 231 (73.10) | ||
| Ever | 112 (35.44) | 85 (26.90) | 5.38 | 0.02 |
| Drinking status | ||||
| Never | 174 (55.06) | 188 (59.49) | ||
| Ever | 142 (44.94) | 128 (40.51) | 1.27 | 0.26 |
| Tumor size | ||||
| < 4 cm | 77 (24.37) | |||
| ≥ 4 cm | 239 (75.63) | |||
| Tumor differentiation | ||||
| Grade 1 | 21 (6.65) | |||
| Grade 2 | 262 (82.91) | |||
| Grade 3 | 33 (10.44) | |||
| Lymph mode metastases | ||||
| No | 144 (45.57) | |||
| Yes | 172 (54.43) | |||
| Relapse | ||||
| No | 300 (94.94) | |||
| Yes | 16 (5.06) | |||