TABLE 4.
Colonoscopy | All No. (%) | Metachronous cancer |
|
---|---|---|---|
Absent No. (%) | Present No. (%) | ||
At least one | 62 (78) | 43 (90) | 19 (95) |
Average frequency* | |||
Every year | 46 (74) | 33 (76) | 13 (68) |
Every 2 years | 8 (13) | 6 (14) | 2 (11) |
Every 3 years | 2 (3) | 2 (5) | 0 (0) |
Unknown frequency | 6 (10) | 2 (5) | 4 (21) |
Mean interval (year) for 1 examination (95 % CI) | 1.16 (1.01–1.31) | 1.17 (0.97–1.36) | 1.13 (0.94–1.33) |
None | 6 (8) | 5 (10) | 1 (5) |
Missing | 11 (14) | 10 | 1 |
Total | 79 | 58 | 21 |
Extracted from the self-reported questionnaire data. The frequency of colonoscopy was assumed to be distributed uniformly in the period between first and last age of colonoscopy