60 cm flexible sigmoidoscopy screening of individuals with a single first degree, or first and second degree relatives, with colorectal cancer over the age of 50 years (1:12–1:17 risk)
| Age (y) | No screened (%) | No with cancer (%) | No with adenoma (%) | No with neoplasia >1cm (%) |
| 20–29 | 7 (5) | |||
| 30–39 | 25 (18) | 1 (4) | ||
| 40–49 | 37 (27) | 2 (5) | 1 (3) | |
| 50–59 | 38 (27) | 4 (11) | 1 (3) | |
| 60–69 | 24 (18) | 2 (8) | 2 (8) | |
| >70 | 6 (4) | 2(33) | 1 (17) | |
| Total | 137 | 2 (1.5) | 11 (8) | 5 (4) |