| Postsurgical attack | p Value | ||
| Positive, n (%) | Negative, n (%) | ||
| Operation time (h, mean (SD)) | 4.5 (2.3) | 4.6 (3.8) | 0.931 |
| Postoperative starvation (days, mean (SD)) | 4.4 (7.4) | 3.8 (3.9) | 0.529 |
| Cancer surgery (%) | 40 (59.7) | 23 (34.3) | 0.003 |
| Surgical sites: | |||
| Intracranial | 1 (1.5) | 1 (1.5) | 1.000 |
| Head and neck | 3 (4.5) | 7 (10.4) | 0.325 |
| Heart and lungs | 8 (11.9) | 11 (16.4) | 0.456 |
| Vascular | 4 (6.0) | 6 (9.0) | 0.744 |
| Hepatobiliary | 3 (4.5) | 10 (14.9) | 0.077 |
| Gastrointestinal | 32* (47.8) | 19* (28.3) | 0.021 |
| Urogenital | 9 (13.4) | 3 (4.5) | 0.128 |
| Musculoskeletal | 8 (11.9) | 8 (11.9) | 1.000 |
| Others | 2 (3.0) | 3 (4.5) | 1.000 |
*Among the 32 patients and 19 controls who underwent gastrointestinal surgeries, 4 and 1 also underwent urogenital surgeries, respectively. They are represented in both groups for this table.