Table 3.
Subgroup analysis: Comparison in various factors between perforation and silent free air
| Perforation (n = 8) | Silent free air on CT (n = 35) | P value | |
| Tumor-related factors | |||
| Location: Upper/middle/ lower | 2/6/0 | 9/21/5 | NS |
| Scar: Positive/negative | 0/6 | 5/30 | NS |
| Depth of invasion: M/SM and beyond | 5/3 | 5/30 | NS |
| Treatment-related factors | |||
| Operator: Experienced/ less-experienced | 2/6 | 16/19 | NS |
| Resected dimensions (cm2) | 24.0 ± 24.9 | 10.4 ± 7.2 | NS |
| Procedure time (min) | 203.1 ± 114.3 | 145.1 ± 76.5 | NS |
| Clinical parameters | |||
| Body temperature | 37.3 ± 0.6 | 36.8 ± 0.6 | 0.04 |
| White blood cell (/mm3) | 9898.8 ± 3149.4 | 10658.0 ± 3119.3 | NS |
| C-reactive protein (mg/dL) | 2.4 ± 1.3 | 1.4 ± 1.0 | 0.03 |
| Oral intake (d) | 3.0 | 4.0 ± 1.5 | NS |
| Hospital stay (d) | 10.9 ± 1.5 | 10.7 ± 2.1 | NS |
Data are expressed as mean ± SD. CT: Computed tomography; M: Intramucosal cancer and adenoma; SM: Submucosal invasive cancer; NS: Not significant.