| 0 | A healthy state |
| 1 | Minor symptoms and capable of running |
| 2 | Able to walk 10 m or more without assistance but unable to run |
| 3 | Able to walk 10 m across an open space with help |
| 4 | Bedridden or chair bound |
| 5 | Requiring ventilation for at least part of the day |
| 6 | Dead |
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