Polyp recurrence rates by randomisation group
| Group | n | No patients with polyps | Person years of follow up in surveillance study | Total No person years of follow up | Polyp recurrence rate3-150 (95% CI) |
|---|---|---|---|---|---|
| High risk | |||||
| (1) 1 yearly FS | 115 | 23 | 443 | 816 | 52 (35, 78) |
| (2) 2 yearly FS | 104 | 16 | 340 | 675 | 47 (29, 77) |
| (3) 2 yearly colon | 86 | 10 | 271 | 587 | 37 (20, 69) |
| Total | 305 | 49 | 1054 | 2078 | 47 (35, 62) |
| Low risk | |||||
| (4) 2 yearly FS | 162 | 14 | 584 | 1102 | 24 (14, 41) |
| (5) 5 yearly FS | 172 | 13 | 409 | 1167 | 32 (19, 55) |
| (6) 5 yearly colon | 134 | 5 | 261 | 801 | 19 (8, 46) |
| Total | 468 | 32 | 1254 | 3070 | 26 (18, 36) |
↵3-150 Per 1000 person years of follow up in surveillance study.
FS, flexible sigmoidoscopy.