Worked example of calculation of POR score based on multivariate ORs
| Risk factor | OR (see table 2) |
| 67 years old | 2.29 |
| Unplanned admission | 1.33 |
| Primary respiratory pathology | 0.79 |
| Short ICU stay | No increase in risk (OR 1.0) |
| Low discharge dependency | No increase in risk (OR 1.0) |
| Short hospital stay prior to ICU | No increase in risk (OR 1.0) |
| No CPR | No increase in risk (OR 1.0) |
| Final POR score | 2.29×1.33×0.79=2.41 |
CPR, cardiopulmonary resuscitation; ICU, intensive care unit; POR, poor outcome risk.