| Variable | Points assigned |
| Age > 80 years | 1 |
| History of cancer | 1 |
| Chronic cardiopulmonary disease | 1 |
| Pulse rate ≥ 110/minute | 1 |
| Systolic blood pressure < 100 mmHg | 1 |
| Arterial oxygen saturation < 90% | 1 |
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