Modified Medical Research Council Dyspnea Scale
| Grade | Criteria |
|---|---|
| 0 | Difficulty breathing during heavy exertion |
| I | Dyspnea when Walking Quickly or Climbing Slighly |
| II | Walking Slower than people of the Same Age |
| III | Dyspnea when Walking 100 m |
| IV | Dyspnea by Changing Clothes or Cannot Leave House due to Dyspnea |