Table 1 American Medical Research Council Dyspnoea Scale [13]

Grade I

Not troubled by breathlessness except with strenuous exercise.

Grade II

Troubled by shortness of breath when hurrying on the level or walking up a slight hill.

Grade III

Walks slower than people of the same age on the level because of breathlessness or has to stop for breath when walking at own pace on the level.

Grade IV

Stops for breath after walking about 100 m or after a few minutes on the level.

Grade V

Too breathless to leave the house or breathless when dressing or undressing.