MRC dyspnoea grade distribution by stage of airflow limitation (first MRC grade from study start). MüllerováHana LuChao LiHao TabbererMaggie 2014 <p>Abbreviations: COPD, chronic obstructive pulmonary disease; MRC, Medical Research Council. MRC scoring 1–5 equals to mMRC grades 0–4 with MRC 1 equals to mMRC 0.</p>