| Group | Number of cases | Atelectasis | Pleural effusion | Pulmonary infection | Incidence (%) |
| Control Group | 40 | 4 | 3 | 4 | 11 (29.00) |
| Observation Group | 40 | 1 | 1 | 1 | 3 (7.500) |
| χ2 |
|
|
|
| 6.582 |
| P |
|
|
|
| 0.010 |