| Grade | Description |
|---|---|
| 1 | No dyspnea except with strenuous exercise. |
| 2 | Shortness of breath when hurrying on level ground or walking up a slight hill. |
| 3 | Walks slower than people of the same age on level ground due to shortness of breath or has to stop for breath when walking at own pace on level ground. |
| 4 | Stops for breath after walking about 100 meters or after a few minutes on level ground. |
| 5 | Too breathless to leave the house or breathless when dressing or undressing. |
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