Table 2. Modified Medical Research Council (mMRC) Dyspnea Scale

Grade Description of breathlessness
0 I only become breathless with strenuous exercise.
1 I get short of breath when hurrying on level ground or walking up a slight hill.
2 On level ground, I walk slower than people of the same age because of breathlessness, or have to stop for breath when walking at my own pace.
3 I stop for breath after walking about 100 yards or after a few minutes on level ground.
4 I am too breathless to leave the house or breathless when dressing or undressing.