Prevalence and characteristics of polyps detected during flexible sigmoidoscopy screeing in Welwyn Garden City and Leicester
| Welwyn Garden City (n=536) | Leicester (n=749) | |
| Cancer | 4 (0.8) | 4 (0.5) |
| Polyps | 108 (21) | 180 (24) |
| Total number per person | ||
| 1 | 74 (14) | 118 (16) |
| 2 | 15 (3) | 33 (4) |
| 3–4 | 16 (3) | 18 (2) |
| 5–9 | 3 (1) | 11 (1) |
| Size (mm)3-150 | ||
| 1–5 | 67 (12) | 153 (20) |
| 6–9 | 16 (3) | 11 (1) |
| 10–14 | 9 (2) | 5 (1) |
| 15+ | 10 (2) | 11 (1) |
| Metaplastic polyps | 68 (13) | 128 (17) |
| Adenomas | 53 (10) | 67 (9) |
| Histology3-150 | ||
| Tubular | 30 (6) | 53 (7) |
| Tubulovillous | 19 (3) | 10 (1) |
| Villous | 4 (1) | 4 (0.5) |
| Dysplasia3-150 | ||
| Mild | 17 (3) | 40 (5) |
| Moderate | 22 (4) | 20 (2) |
| Severe | 13 (2) | 6 (1) |
| High risk3-151 | 32 (6) | 44 (6) |