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Fig. 2 | Respiratory Research

Fig. 2

From: Reference values of impulse oscillometry (IOS) for healthy Chinese children aged 4–17 years

Fig. 2

Pearson’s correlation for resistance at 5 Hz, resistance at 20 Hz, reactance at 5 Hz, impedance at 5 Hz, resonant frequency, and reactance curve area below zero for boys and girls. R5 = resistance at 5 Hz, R20 = resistance at 20 Hz, X5 = reactance at 5 Hz, Fres = resonant frequency, Z5 = impedance at 5 Hz, R5–R20 = fall in resistance between R5 and R20

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