Table 1 Melbourne Group Scale Evaluation Criteria

1.

Chest radiograph report of collapse/consolidation;

2.

Leukocyte cell count > 11.2 × 10⁹/L or prescription of an antibiotic specific for respiratory infection (except for those routinely used after surgery);

3.

Oral temperature > 38 °C, without fever caused by reasons other than lung;

4.

Microbiological evidence of sputum (+);

5.

Yellow or green sputum different from preoperative assessment;

6.

SpO₂ is < 90% in indoor environment;

7.

Clinical diagnosis of pneumonia or pulmonary infection;

8.

Stay in the care unit for > 36 h or enter the care unit again due to respiratory problems.