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Table 1 The Medical Research Council/American Thoracic Society Dyspnea Grading Method [9]

From: Long-term results of diaphragmatic plication in adults with unilateral diaphragm paralysis

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