| Grade | Description |
|---|---|
| 0 | Normal activity. |
| 1 | Normal activity with mild symptoms or signs. |
| 2 | Normal activity with some difficulty, exhibiting some symptoms or signs. |
| 3 | Self-sufficient in daily life but unable to perform normal activities or work. |
| 4 | Mostly self-sufficient in daily life but occasionally needs assistance. |
| 5 | Frequently requires assistance in daily life, needing frequent medical support. |
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