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| Grade | Clinical description |
|---|---|
| 1 | Asymptomatic; clinical or diagnostic observations only; intervention not indicated |
| 2 | Symptomatic; medical intervention indicated; limiting instrumental activities of daily living (ADL) |
| 3 | Severe symptoms; limiting self-care ADL; oxygen indicated |
| 4 | Life-threatening respiratory compromise; urgent intervention indicated (e.g., tracheotomy or intubation) |
| 5 | Death |
