| Variables | Advanced lesions | Non-advanced lesions | Hyperplastic polyps | No lesions | p Value |
| Mean age of index patient (years) | 55.4 | 59.4 | 53.2 | 61 | 0.3 |
| Mean age of first-degree relative (years) | 51.8 | 50.3 | 44.9 | 45 | 0.03 |
| Sex of index patient (%) | |||||
| Male | 16.3 | 29.1 | 14 | 54.7 | 0.1 |
| Female | 8.5 | 23.4 | 8.5 | 68.1 | |
| Sex of first-degree relative (%) | |||||
| Male | 16.7 | 39.4 | 18.2 | 43.9 | 0.000 |
| Female | 10.4 | 14.9 | 6 | 74.6 | |
| Hereditary type (%) | |||||
| Amsterdam II | 26.7 | 33.3 | 13.3 | 40 | 0.2 |
| Bethesda | 14.7 | 22.7 | 17.3 | 62.7 | |
| Sporadic | 7 | 32.6 | 2.3 | 60.5 |