TABLE 4.

z-scores of oscillometric parameters corresponded to forced expiratory volume in 1 s (FEV₁) z-score −2.5 and −4

	R5 z-score		R20 z-score		R5−R20 z-score		X5 z-score
FEV1 z-score	−2.5	−4	−2.5	−4	−2.5	−4	−2.5	−4
Healthy	1.024	1.506	0.656	0.925	1.787	2.448	−2.129	−3.162
ILD	2.859	4.682	1.475	2.162	3.089	5.02	−5.2	−8.558
Asthma	2.374	4.006	1.196	1.518	2.737	5.367	−3.606	−8.815
COPD	1.318	1.954	0.35	0.479	2.072	3.223	−3.146	−4.374
Bronchiectasis	2.022	3.624	0.632	1.129	2.608	4.573	−4.683	−8.185
UAO	7.932	10.188	3.645	4.055	8.209	11.52	−15.639	−21.406
Average of asthma+COPD+bronchiectasis	2.418	4.104			2.811	4.987	−4.496	−8.519

R₅: resistance at 5 Hz; R₂₀: resistance at 20 Hz; X₅: reactance at 5 Hz; ILD: interstitial lung disease; UAO: upper airway obstruction.