Table Breathlessness Measurement Using the Modified British Medical Research Council (mMRC) Questionnaire Grade Shortness of Breath 0 None except during strenuous exercise 1 Occurring when hurrying on level ground or walking up a slight incline 2 Resulting in walking more slowly than people of the same age on level ground or Resulting in stopping for breath when walking at own pace on level ground 3 Resulting in stopping for breath after walking about 100 meters or after a few minutes on level ground 4 Preventing the person from leaving the house or Occurring when dressing or undressing Adapted from Mahler DA, Wells CK: Evaluation of clinical methods for rating dyspnea.