Table 4. Attenuation values from 3D-cHRCT images of patients with normal and low %DLCO.

	Normal %DLCO ≥80%	Low %DLCO <80%	P value
Number	70	25
%LAA	26.6 ± 7.2	29.1 ± 8.7	0.080
%HAA	3.9 ± 1.5	4.8 ± 2.5	0.011

Comparisons of %low attenuation area (%LAA) and %high attenuation area (%HAA) in patients with normal and low diffusion capacity. Both %HAA and %LAA of patients with low diffusing capacity of the lungs for carbon monoxide measured as percent predicted (%DLco) were higher than the values of the patients with normal %DLco. However, only %HAA was significantly different (P = 0.011).

3D-cHRCT, three-dimensional curved high-resolution computed tomography; %DLCO, diffusing capacity of the lungs for carbon monoxide measured as percent predicted