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Table 1 American Medical Research Council Dyspnoea Scale [13]

From: Adolescent and adult laryngotracheal stenosis: a review

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.
  1. Used with the permission of the Medical Research Council [13]