Table 3 Distribution of the basic characteristics of CRC patients and controls
Variables | CRCs (n = 361), n% | Controls (n = 358), n% | *P value |
|---|---|---|---|
Age (years) |  |  |  < 0.0001 |
Mean ± SD | 60.38 ± 10.28 | 55.82 ± 11.92 | < 0.0001 |
  ≤ 50 | 53 (14.68%) | 104 (29.05%) |  |
 50- | 114 (31.58%) | 102 (28.49%) |  |
 60- | 135 (37.40%) | 116 (32.40%) |  |
  > 70 | 59 (16.34%) | 36 (10.06%) |  |
Gender | Â | Â | 0.111 |
 Male | 225 (62.33%) | 202 (56.42%) |  |
 Female | 136 (37.67%) | 156 (43.58%) |  |
BMI | Â | Â | 0.146 |
Mean ± SD | 23.37 ± 4.36 | 23.81 ± 3.84 |  |
  < 18.5 | 20 (5.54%) | 16 (4.47%) |  |
 18.5- | 107 (29.64%) | 104 (29.05%) |  |
  ≥ 23 | 234 (64.82%) | 238 (66.48%) |  |
Education | Â | Â | 0.080 |
 Primary school and below | 161 (44.60%) | 134 (37.43%) |  |
 Junior senior and above | 200 (55.40%) | 224 (62.57%) |  |
Ethic group | Â | Â | 0.847 |
 Han | 349 (96.68%) | 344 (96.09%) |  |
 Others | 12 (3.32%) | 14 (3.91%) |  |
Marriage status | Â | Â | 0.896 |
 Married | 331 (90.94%) | 325 (90.78%) |  |
 Others | 30 (9.06%) | 33 (9.22%) |  |
Occupation | Â | Â | 0.507 |
 White collar | 256 (70.91%) | 262 (73.18%) |  |
 Blue collar | 105 (29.09%) | 96 (26.82%) |  |
Family history of CRC | Â | Â | 0.138 |
 No | 318 (88.09%) | 328 (91.62%) |  |
 Yes | 43 (11.91%) | 30 (8.38%) |  |
Alcohol drinking | Â | Â | < 0.0001 |
 No | 204 (56.51%) | 252 (70.39%) |  |
 Yes | 157 (43.49%) | 106 (29.61%) |  |
Smoking | Â | Â | 0.668 |
 No | 253 (70.08%) | 269 (75.14%) |  |
 Yes | 108 (29.92%) | 89 (24.86%) |  |