Table 4.
distribution of tumor sites by family history of colorectal cancer according to age of the proband.
| Age group | Positive FH† of CRC | Negative FH of CRC |
| CRC localization | ||
| Total† | N = 76 | N = 373 |
| Righta | 28(36.9%) | 66(17.7%) |
| Left | 24(31.6%) | 167(44.8%) |
| Rectum | 22(29%) | 139(37.3%) |
| NOS | 2(2.5%) | 1(0.03%) |
| Over 45 | N = 43 | N = 294 |
| Rightb | 14(32.6%) | 49(16.7%) |
| Left | 11(25.6%) | 136(46.3%) |
| Rectum | 18(41.8%) | 109(37.1%) |
| Less than 45 | N = 33 | N = 79 |
| Rightc | 14(42.4%) | 17(21.5%) |
| Left | 13(39.4%) | 31(39.2%) |
| Rectum | 4(12.1%) | 30(38%) |
| NOS | 2(6.1%) | 1(1.3%) |
†: difference of tumor site distribution between two groups (p < 0.001)
a,b,c: p < 0.05