Figure 3From: MRC chronic Dyspnea Scale: Relationships with cardiopulmonary exercise testing and 6-minute walk test in idiopathic pulmonary fibrosis patients: a prospective study The correlation between the MRC chronic dyspnea score and the VE/VCO 2 at anaerobic threshold (AT) at cardiopulmonary exercise test in the study population (n = 25) r = .63, p < 0.002.Back to article page