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Comparisons of the z-scores of oscillometric parameters between different groups. R5: resistance at 5 Hz; R20: resistance at 20 Hz; X5: reactance at 5 Hz; fres: resonant frequency; AX: reactance area; ILD: interstitial lung disease; UAO: upper airway obstruction; ULN: upper limit of normal (1.645); LLN: lower limit of normal (−1.645). ns: nonsignificant between-group difference (p>0.05); other between-group differences without this notation were all significant (p<0.05).
