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Respiratory impedance in the CPFE OB−, CPFE OB+, and COPD groups.
Notes: *P<0.05, **P<0.01 versus COPD. Values are means ± standard error of the mean.
Abbreviations: CPFE, combined pulmonary fibrosis and emphysema; OB-, without airflow obstruction; OB+, with airflow obstruction; COPD, chronic obstructive pulmonary disease; Rrs5, respiratory resistance at 5 Hz; Rrs20, respiratory resistance at 20 Hz; Xrs5, respiratory reactance at 5 Hz; △Xrs5, within-breath changes in Xrs5.
