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Equations of the z-scores of oscillometric parameters predicted by the forced expiratory volume in 1 s (FEV1) z-score. The solid lines represent medians and the shaded areas 95% confidence intervals. R5: resistance at 5 Hz; R20: resistance at 20 Hz; X5: reactance at 5 Hz; ILD: interstitial lung disease; UAO: upper airway obstruction.
