TABLE 2

Impulse oscillometry data (combined inspiratory and expiratory)

	Control	EDAC	p-value	COPD	p-value	COPD+EDAC	p-value
R₅ cmH₂O·s⁻¹·L⁻¹	0.26±0.61	1.03±1.08	0.040	2.14±0.89	0.001	1.63±1.44	0.034
R₂₀ cmH₂O·s⁻¹·L⁻¹	0.02±0.83	0.19±1.01	0.700	0.33±0.78	0.017	1.07±0.66	0.447
X₅ cmH₂O·s⁻¹·L⁻¹	0.50±0.55	−0.61±1.31	0.010	−1.13±1.32	0.016	−1.8±2.42	0.031
f_res L·s⁻¹	−0.38±0.56	1.17±0.88	<0.001	2.68±1.1	<0.001	0.86±3.18	0.311
A_X cmH₂O·s⁻¹·L⁻¹	−0.39±0.52	1.17±0.94	<0.001	2.29±0.82	<0.001	1.85±1.09	0.001

Data are presented as mean±sd of z-scores, unless otherwise stated. EDAC: expiratory dynamic airway collapse; COPD: chronic obstructive pulmonary disease; R₅: resistance at 5 Hz; R₂₀: resistance at 20 Hz; X₅: reactance at 5 Hz; f_res: resonant frequency; A_X: area under the reactance curve.