Table 5. Comparisons of parameters in stable COPD group according to different stage (n=36).

Values are presented as mean±standard deviation.

COPD, chronic obstructive pulmonary disease; MIP, maximal inspiratory pressure; MEP, maximal expiratory pressure; FEV1, force expiratory volume in 1 second; FVC, force vital capacity; mMRC, modified British Medical Research Council; CAT, COPD Assessment Test.

^**p<0.01, ^***p<0.001.

^a)Kruskal-Wallis test with Bonferroni correction.