Table 2.

Modified Medical Research Council (MRC) Scale

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

From [23] mod.