Associations of airway tree to lung volume ratio on computed tomography with lung function and symptoms in chronic obstructive pulmonary disease

Table 2 Pearson correlation coefficients between airway and lung size indices, emphysema severity, and physiological measurements

	FEV₁ (L)	%FEV₁ (%)	RV/TLC (%)	%D_LCO (%)
Lumen area
Ai (mm²)	0.27^b	0.24^b	−0.24^b	− 0.05
Ai / (pTLC)^2/3 (%)	0.16^a	0.18^a	−0.19^a	−0.09
Ai / (rLV)^2/3 (%)	0.31^b	0.32^b	−0.33^b	0.01
Lung volume
rLV (ml)	−0.14	−0.21^a	0.22^a	−0.12
rLV / pTLC (%)	−0.37^b	−0.35^b	0.33^b	−0.21^a
Airway tree volume
AWV (ml)	0.41^b	0.43^b	−0.35^b	0.00
AWV / pTLC (%)	0.27^b	0.36^b	−0.29^b	−0.06
AWV% (%)	0.48^b	0.56^b	−0.47^b	0.07
Emphysema
LAV%	−0.48^b	−0.48^b	0.43^b	−0.62^b

ISSN: 1465-993X