Table 4

Correlations between chest high-resolution CT and functional parameters expressed as z scores

HRCT parameters	FEV₁	FVC	FEF_25–75%	FEV₁/FVC	Raw	sRaw	sReff	FRCpleth	RV	TLC	RV/TLC
Severity of bronchiectasis	NS	NS	NS	NS	NS	p=0.034	p=0.049	p=0.027	p=0.002	p=0.050	p=0.004
Severity of bronchiectasis	NS	NS	NS	NS	NS	r=0.313	r=0.293	r=0.326	r=0.445	r=0.291	r=0.421
Extent of bronchiectasis	NS	NS	NS	NS	NS	p=0.019	p=0.025	p=0.002	p<0.001	p=0.039	p<0.001
Extent of bronchiectasis	NS	NS	NS	NS	NS	r=0.344	r=0.331	r=0.446	r=0.547	r=0.306	r=0.519
Peribronchial thickening	NS	NS	NS	NS	NS	NS	NS	NS	NS	NS	NS
Extent of mucous plugging	NS	NS	NS	NS	p=0.049	NS	NS	NS	NS	NS	NS
Extent of mucous plugging	NS	NS	NS	NS	r=0.295	NS	NS	NS	NS	NS	NS
Consolidation or atelectasis	NS	NS	NS	NS	NS	NS	NS	NS	NS	NS	NS
Air-trapping	NS	NS	NS	NS	NS	NS	NS	p=0.012	p=0.001	NS	p<0.001
Air-trapping	NS	NS	NS	NS	NS	NS	NS	r=0.367	r=0.483	NS	r=0.696

FEF_25–75%, forced expiratory flow between 25% and 75% of forced vital capacity; FEV₁, forced expiratory volume in 1 s; FRCpleth, functional residual capacity by plethysmography; FVC, forced vital capacity; HRCT, high-resolution CT; NS, non-significant; Raw, airway resistance; RV, residual volume; sRaw, specific airway resistance; sReff, effective specific resistance; TLC, total lung capacity.