Demographics and clinical characteristics of the total COPD cohort (at observation period start) further split by the MRC dyspnoea grade (first recorded from study start). MüllerováHana LuChao LiHao TabbererMaggie 2014 <p>Percentages are based on row total. MRC scoring 1–5 equals to mMRC grades 0–4 with MRC 1 equals to mMRC 0.</p><p><sup>a</sup> Other smoker: no record about smoking history or record of passive smoking.</p><p>Data on BMI were missing for 865 (1.7%) patients.</p><p>Data on GOLD grade were missing for 1002 (2%) patients.</p><p>Abbreviations: BMI, body mass index; COPD, chronic obstructive pulmonary disease; GOLD, global initiative for obstructive lung disease; GP, general practitioner; MRC, Medical Research Council; SD, standard deviation.</p>