Table 1.

The Medical Research Council/American Thoracic Society Dyspnea Grading Method [9]

Grade	Severity	Explanation
Grade 0	None	No trouble with breathing except with strenuous exercise
Grade 1	Mild	Trouble with shortness of breath when hurrying on level or walking up a slight hill
Grade 2	Moderate	Walks slower than people of same age on the level or has to stop for breath walking at own pace on the level
Grade 3	Severe	I stop for breath after walking 100 yards or after a few minutes on the level.
Grade 4	Very severe	Too breathless to leave the house or breathless when dressing or undressing