Table 4.

Reproducibility of FOT Parameters in Subjects with no Severity Change

	Correlation coefficient	p-value
FEV1 (L)	0.79	< 0.01
Impedance (Zrs, hPa/l/s)	0.49	< 0.05
Resonant frequency (Fres, Hz)	0.47	< 0.05
Resistance at 5 Hz (R5Hz, hPa/l/s)	0.78	< 0.01
Resistance at 20 Hz (R20Hz, hPa/l/s)	0.65	< 0.01
Resistance at 35 Hz (R35Hz, hPa/l/s)	0.81	< 0.01
Reactance at 5 Hz (X5Hz, hPa/l/s)	0.18	> 0.05

n=20, mean time interval of repeated test: 6 months.