Occurrence of colorectal neoplasia based on timing of follow-up colonoscopy and their 5-year cumulative rates in different risk groups
| Normal group* (n=1242) | Low-risk group† (n=671) | High-risk group‡ (n=539) | |||||||
| n | Any adenoma | Advanced adenoma | n | Any adenoma | Advanced adenoma | n | Any adenoma | Advanced adenoma | |
| n (%) | n (%) | n (%) | n (%) | n (%) | n (%) | ||||
| First follow-up <3 years | 141 | 33 (23.4) | 4 (2.8) | 355 | 101 (28.5) | 6 (1.7) | 516 | 189 (36.6) | 52 (10.1) |
| Repeat surveillance§ | 78 | 13 (16.7) | 1 (1.3) | 165 | 37 (22.4) | 3 (1.8) | 419 | 110 (26.3) | 12 (2.9) |
| First follow-up 3–5 years | 1101 | 311 (28.2) | 20 (1.8) | 316 | 169 (53.5) | 7 (2.2) | 23 | 10 (43.5) | 2 (8.7) |
| 5-year cumulative results¶ | 1242 | 357 (28.7) | 25 (2.0) | 671 | 307 (45.8) | 16 (2.4) | 539 | 309 (57.3) | 66 (12.2) |
↵* Subjects with no adenoma at baseline colonoscopy.
↵† Subjects with one or two adenomas <10 mm at baseline colonoscopy.
↵‡ Subjects with an advanced adenoma or ≥3 adenomas at baseline colonoscopy.
↵§ Summation of the results in subjects with a second (or more) surveillance colonoscopy.
↵¶ The most advanced lesion found on any colonoscopy during follow-up.