Table 2. Mean values and t-test for comparison between groups.

	Volume	MLD	FWHM	LAV
Group 1	3.2 ± 1.8	-778± 89	109 ± 46	1.2 ± 1.5
Group 2	3.3 ± 1.7	-713 ± 112	132 ± 61	0.5 ± 1.2
p-value	0.32	0.0001	<0.01	0.01

Shown are the mean values with standard deviation of the four quantitative lung parameters for both protocols used.

Volume is shown in liter, mean lung density (MLD) in HU, full width at half maximum (FWHM) in HU and low attenuated volume in percentage of total lung volume. Further, the p-value shows the significance level of the t-test.