Impulse oscillometry for detection of small airway dysfunction in subjects with chronic respiratory symptoms and preserved pulmonary function

Table 2 Spearman correlation coefficients of symptom scores with spirometry and IOS parameters in subjects with chronic respiratory symptoms and PPF (n = 209)

Spirometry parameter	FEV₁%	FVC %	FEV₁ /FVC	FEF_25–75% %	FEF_50% %	FEF_75% %
mMRC	− 0.004	0.021	− 0.072	− 0.082	− 0.084	− 0.126
CAT	0.029	0.112	− 0.188**	− 0.135	− 0.124	− 0.169*

IOS parameter	R5	R20	R5–R20	X5	AX	Fres
mMRC	0.150*	0.111	0.162*	− 0.127	0.179**	0.131
CAT	0.243**	0.174*	0.150*	− 0.200**	0.204**	0.212**

ISSN: 1465-993X