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Table 2 Correlation coefficients of factors that showed significant correlations with the functional dyspnea score as determined with the Modified Medical Research Council scale.

From: Gender and respiratory factors associated with dyspnea in chronic obstructive pulmonary disease

Clinical and Physiological Parameter Correlation coefficient*
  Men Women
BMI -0.29 -0.28
ffmi -0.39 ns
FEV 1 % -0.64 -0.45
FVC % -0.45 -0.33
IC/TLC -0.52 -0.27
DLCO -0.54 ns
PaO 2 -0.59 ns
PaCO 2 0.27 ns
P 0.1 /P imax 0.47 0.46
VAS pre 6MWD 0.37 0.52
VAS post 6MWD 0.52 0.48
  1. Estimated by Spearman's rank or tau-b Kendall linear correlation coefficients; ns = stastistically non significant