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Table 2 Correlation coefficients between the changes in different dyspnea measurements

From: Analysis of longitudinal changes in dyspnea of patients with chronic obstructive pulmonary disease: an observational study

  OCD (/year) mMRC (/year) CRQ dyspnea (/year) SGRQ activity (/year) Borg score (/year)
OCD (/year) 1     
mMRC (/year) -0.51* 1    
CRQ dyspnea (/year) 0.45* -0.49* 1   
SGRQ activity (/year) -0.52* 0.52* -0.52* 1  
Borg score (/year) -0.06 0.04 -0.10 0.02 1
  1. * p < 0.001. OCD Oxygen Cost Diagram, mMRC modified Medical Research Council dyspnea scale, CRQ Chronic Respiratory Disease Questionnaire, SGRQ St. George’s Respiratory Questionnaire.