| Score | Description |
| 0 | No symptoms at all |
| 1 | No significantly disability despite symptoms; able to carry out all usual duties and activites |
| 2 | Slight disability; unable to carry out all previous activities, but able to look after own affairs without assistance |
| 3 | Moderately disability; requiring some help, but able to walk without assistance |
| 4 | Moderately severe disability; unable to walk without assistance and unable to attend the own bodily needs without assistance |
| 5 | Severe disability, bedridden, incontinent and requiring constant nursing care and attention |
| 6 | Death |