| 0 | Fully active, able to carry out all pre-disease performance without restriction |
| 1 | Physically strenuous activity is restricted, but is ambulatory and able to carry out work of a light or sedentary nature, e.g., light housework, office work |
| 2 | Ambulatory and capable of all selfcare but unable to carry out any work activities. Up and about for >50% of waking hours |
| 3 | Capable of only limited selfcare, confined to bed or chair for >50% of waking hours |
| 4 | Completely disabled. Cannot carry out any selfcare. Totally confined to bed or chair |
| 5 | Dead |