TABLE 4.
Postoperative pneumonia (POP) in all study participants
| Parameters | Experimental group | Control group | X 2 | p‐value |
|---|---|---|---|---|
| Periodontitis | ||||
| Mild | 0 | 1 | 11.69 | 0.0006a |
| Moderate | 2 | 7 | ||
| Severe | 2 | 10 | ||
| Lung cancer | 3 | 12 | 11.83 | 0.0006a |
| Sophageal cancer | 1 | 6 | ||
| Lung surgery | ||||
| Wedge resection | 0 | 1 | ||
| Lobectomy | 1 | 2 | 7.16 | 0.0075a |
| Segmentectomy | 1 | 4 | ||
| Sleeve resection | 1 | 5 | ||
| Esophageal surgery | ||||
| Cervical anastomosis | 0 | 1 | 4.14 | 0.0419a |
| Above aortic arch | 0 | 2 | ||
| Below aortic arch | 1 | 3 | ||
a
Significant difference between two groups by X 2 test of Mantel–Haenszel–Cochran (p < 0.05).