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	FEF25–75% %	FEF50% %	FEF75% %
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**

FEV_1, FVC, FEF_25–75%, FEF_50% and FEF_75% are expressed as % predicted

Values in italic indicate significant correlations after Bonferroni correction

*P < 0.05

**P < 0.01