Melbourne Group Scale (MGS)
| Variables | Percentage of PPC patients positive for each variable |
| Chest x-ray atelectasis /infiltration | 91% |
| Purulent sputum | 85% |
| Physician diagnosis of pneumonia/chest infection | 82% |
| Temperature >38°C | 79% |
| Oxygen saturation <90% on air | 59% |
| Positive signs on sputum microbiology | 38% |
| White cell count >11.2 units | 32% |
| Readmission/prolonged stay ITU/HDU | 29% |
4 of 8 factors indicate PPC.
HDU, high dependency unit; ITU, intensive therapy unit; PPC, postoperative pulmonary complications.