Figure 1From: Analysis of longitudinal changes in dyspnea of patients with chronic obstructive pulmonary disease: an observational studyCorrelation of the annual change in FEV 1 with the annual changes in dyspnea measurements of (A) OCD, (B) mMRC, (C) CRQ dyspnea, and (D) SGRQ activity. Positive changes in OCD and CRQ dyspnea scores indicate better dyspneic status, which are indicated by negative changes in mMRC and SGRQ activity.Back to article page