TABLE 4

Correlations between VCap parameters and the lung clearance index

	Cystic fibrosis			Healthy controls
	r	r²	p-value^#	r	r²	p-value^#
SII	−0.52	0.27	<0.001	−0.04	0.00	0.764
Normalised SII	−0.44	0.20	0.002	−0.01	0.00	0.912
SIII	−0.18	0.03	0.209	0.04	0.00	0.771
Normalised SIII	−0.07	0.01	0.623	0.06	0.00	0.629
KPIv	0.29	0.08	0.04	0.124	0.02	0.325
CII1	0.68	0.47	<0.001	0.06	0.00	0.620
CII2	0.66	0.44	<0.001	0.11	0.01	0.389

Data are presented as Pearson correlation coefficients (r) and coefficients of determination (r²). VCap: volumetric capnography; SII: slope of phase II; SIII: slope of phase III; KPIv: capnographic index; CII: capnographic inhomogeneity index. ^#: t-test.