Table 3—

Spearman correlation coefficients (rho) for relationships between disease-specific health status and measures of lung function and high-resolution computed tomography pixel index

	St. George's Respiratory Questionnaire
	Symptoms	Activity	Impacts	Total
Lung function
FEV₁	−0.45	−0.60	−0.47	−0.55
sG_aw	−0.46	−0.66	−0.52	−0.60
RV/TLC	0.47	0.51	0.49	0.52
T_L,CO	−0.43	−0.57	−0.46	−0.53
K_CO	−0.36	−0.43	−0.39	−0.43
HRCT pixel index
Upper zone inspiratory	0.31	0.42	0.31	0.38
Upper zone expiratory	0.38	0.53	0.37	0.46
Lower zone inspiratory	0.31	0.44	0.36	0.39
Lower zone expiratory	0.41	0.58	0.44	0.50

FEV₁: forced expiratory volume in one second
sG_aw: specific airways conductance
RV: residual volume
TLC: total lung capacity
T_L,CO: transfer factor of the lung for carbor monoxide
K_CO: carbor monoxide transfer coefficient
expressed as a percentage of predicted
percentage of pixels <−910 HU
All correlations are highly significant (p<0.001)