Fig. 3

Comparison of impedance values in the C model measured with the IOS, MG-pulse, and MG-noise. Plotted data are the mean values of three measurements. The estimated reactance values were calculated from the mathematical model: X = −1/(2πfC _air), where f is the frequency (Hz) and C _air is the gas compliance of air (l/kPa). a C model-1 (8.35-l box). b C model-2 (16.7-l box)