Table 2.

Correlations between the changes in CT measurements and FEV₁ after bronchodilator treatment

	Region	Rho	95% CI	p value
Change in lung volume	RUL	−0.20	−0.48 to 0.11	.20
	RML	−0.25	−0.52 to 0.06	.11
	RLL	−0.30	−0.56 to 0.01	.06
	LUL	−0.35	−0.60 to −0.05	.02
	LLL	−0.14	−0.43 to 0.18	.40
Change in airway volume	RUL	0.17	−0.15 to 0.45	.29
	RML	0.16	−0.16 to 0.45	.32
	RLL	0.22	−0.10 to 0.49	.18
	LUL	0.09	−0.22 to 0.39	.57
	LLL	0.31	−0.0001 to 0.56	.05
Change in AWV%	RUL	0.21	−0.10 to 0.49	.19
	RML	0.23	−0.09 to 0.50	.15
	RLL	0.41	0.12 to 0.64	.007
	LUL	0.21	−0.10 to 0.49	.18
	LLL	0.45	0.17 to 0.67	.003

The rho values are Spearman rank correlation coefficients.

Abbreviations: 95% CI, 95% confidence interval; AWV%, airway tree to lung volume percentage ratio.; left upper lobe; LLL, left lower lobe; RLL, right lower lobe. LUL; RML, right middle lobe; RUL, right upper lobe.