Table 1.

Correlation coefficients between CT and lung function parameters

	Normal	COPD ≤ 30	COPD > 30
n	30	31	42
LAA% vs. DLCO/VA	−0.203	−0.276	−0.362*
D vs. DLCO/VA	0.422*	0.407*	0.42*
LAA% vs. FEV1/FVC	0.174	−0.190	0.279
D vs. FEV1/FVC	−0.0060	0.312	0.203

COPD ≤ 30 and COPD > 30 represent those COPD patients whose LAA% was ≤30% and >30%, respectively. 

^*P < 0.05 (Fisher’s Z transform)