Table 3

Correlation between chest high-resolution CT and functional parameters expressed as per cent of predicted normal

HRCT parameters	FEV₁	FVC	FEF_25–75%	FEV₁/FVC	Raw	sRaw	sReff	FRCpleth	RV	TLC	RV/TLC
Severity of bronchiectasis	p=0.01	p=0.005	NS	NS	NS	NS	NS	NS	p=0.02	NS	p=0.005
Severity of bronchiectasis	r=−0.350	r=−0.393	NS	NS	NS	NS	NS	NS	r=0.331		r=0.408
Extent of bronchiectasis	p=0.01	p=0.01	p=0.02	NS	NS	NS	NS	NS	p=0.02	NS	p=0.001
Extent of bronchiectasis	r=−0.346	r=−0.356	r=−0.316	NS	NS	NS	NS	NS	r=0.336	NS	r=0.459
Peribronchial thickening	NS	NS	NS	NS	NS	NS	NS	NS	NS	NS	NS
Extent of mucous plugging	NS	NS	NS	NS	p=0.035	p=0.044	NS	NS	NS	NS	NS
Extent of mucous plugging	NS	NS	NS	NS	r=0.315	r=0.301	NS	NS	NS	NS	NS
Consolidation or atelectasis	NS	NS	NS	NS	NS	NS	NS	NS	NS	NS	NS
Air-trapping	p=0.01	NS	p=0.01	p=0.04	NS	p=0.027	p=0.023	p=0.002	p<0.001	p=0.008	p<0.001
Air-trapping	r=−0.341	NS	r=−0.362	r=−0.291	NS	r=0.327	r=0.334	r=0.438	r=0.728	r=0.389	r=0.757

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.