Risk analysis of colorectal cancer (CRC) in first-degree relatives of patients with hyperplastic polyposis syndrome compared with population-based data from the Eindhoven Cancer Registry
| Group | Person-years | Observed CRCs | Expected CRCs | RR (observed/expected) | 95% CI |
| Males | 4736 | 15 | 2.3 | 6.5 | 3.9 to 10.8 |
| Females | 6317 | 12 | 2.6 | 4.6 | 2.6 to 8.0 |
| Combined | 11053 | 27 | 5.0 | 5.4 | 3.7 to 7.8 |