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Types of surgery during the two periods
| Prior period (n = 131) | Latter period (n = 151) | |||
| Overall | High risk group | Overall | High risk group | |
| Resection of the colon | 73 | 18 | 95 | 46 |
| Resection of the rectum with the stoma | 31 | 10 | 28 | 16 |
| Resection of the rectum without the stoma | 27 | 12 | 28 | 13 |
| Total | 131 | 40 | 151 | 75 |
