Table 1.
Baseline characteristics of the cases and controls
| Variables | Cases (412) | Percentage | Controls (412) | Percentage | P-value |
|---|---|---|---|---|---|
| Age (years, M + SD) | 61.2±10.5 | 61.2±10.5 | >0.05 | ||
| Sex | |||||
| Male | 293 | 71.10 | 293 | 58.50 | >0.05 |
| Female | 119 | 28.90 | 119 | 41.50 | |
| Smoking | |||||
| Yes | 105 | 25.50 | 89 | 21.60 | 0.954 |
| No | 307 | 74.50 | 333 | 78.40 | |
| Drinking | |||||
| Yes | 113 | 27.40 | 101 | 24.51 | 0.965 |
| No | 301 | 72.60 | 311 | 75.49 | |
| Location | |||||
| Right colon | 210 | 51.00 | |||
| Left colon | 97 | 23.54 | |||
| Rectum | 105 | 25.46 | |||
| Differentiation | |||||
| High/moderate | 332 | 80.58 | |||
| Poor/undifferentiated | 80 | 19.41 | |||
| Tumor-Node-Metastasis (TNM) | |||||
| I/II | 287 | 69.66 | |||
| III | 125 | 30.34 | |||
| Cancer invasion | |||||
| T1/T2 | 90 | 21.84 | |||
| T3/T4 | 322 | 78.16 | |||
| Node metastasis | |||||
| N0/N1 | 89 | 21.60 | |||
| N2/N3 | 323 | 78.40 | |||
Abbreviations: M, mean; SD, standard deviation.