| Grade | Description |
|---|---|
| 0 | No dyspnea except during strenuous exercise. |
| 1 | Short of breath when walking fast on level ground or climbing small hills. |
| 2 | Walks slower than peers on level ground due to shortness of breath, or has to stop to catch breath when walking at their own pace on level ground. |
| 3 | Has to stop to catch breath after walking about 100 meters or a few minutes on level ground. |
| 4 | Too short of breath to leave the room or feels short of breath when dressing or undressing. |
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