Table 4.
Frequency of colonoscopy or sigmoidoscopy after extensive or segmental colon resection for their first colon cancer
| Colonoscopy or Sigmoidoscopy# | Extent of resection
|
|
|---|---|---|
| Extensive no (%) | Segmental no (%) | |
| At least one | 37 (80) | 269 (86) |
| Average frequency* | ||
| every year | 25 (67) | 144 (54) |
| every 2 years | 8 (22) | 55 (20) |
| every 3 years | 1 (3) | 29 (11) |
| every 4 years | 0 (0) | 3 (1) |
| every 5 years | 1 (3) | 5 (2) |
| every 6 years | 0 (0) | 3 (1) |
| unknown frequency | 2 (5) | 30 (11) |
| Mean interval (months) for one examination (95%CI) | 16 (13–20) | 20 (18–21) |
| P 0.16† | ||
| None | 9 (20) | 42 (14) |
| Missing | 4 | 21 |
|
| ||
| Total | 50 | 332 |
#
extracted from the self-reported questionnaire data
*
The frequency of the endoscopic examinations was assumed to be distributed uniformly in the period between first and last age of the endoscopic examinations.
†
Student’s t-test comparing the interval for one colonoscopy or sigmoidoscopy after extensive colon resection with that after segmental colon resection