Table 1

Method	Spirometric					Freeflowmetric
Parameter	FIVC	FVC	ΔFVC	FEV1	FEV1/FVCmax	fFVC-CM	ΔfFVC]
	[L]	[L]	[ml]	[L]		[L]	[ml]
COPD	1,55	1,04	510	0,92	0,59	1,63	590
Control	2,77	2,38	390	2,11	0,76	2,45	70
	NS	p<0,05	NS	p<0,05	NS	NS	p<0,05

ΔFVC = FIVC – FVC; fFVC-CM = measurement of FVC through partially closed mouth; ΔfFVC = fFVC-CM – FVC.