Table 3.

Lung volume (ml) calculated for the whole lung parenchyma as well as for each HU compartment (hyper-, normally, poorly and non-inflated)

	Lung volume (ml)		Lung volume (%)
	Mean	SD	Mean	SD
Panel A
All patients
Total lung	2248	894
Hyperinflated	676	614	30	18
Normally inflated	822	409	36	11
Poorly inflated	535	249	24	11
Non-inflated	216	200	10	10

	Lung volume (ml)		Lung volume (%)
	Mean	SD	Mean	SD
Panel B
No-Steroids
Total lung	2377	974
Hyperinflated	679	468	29	13
Normally inflated	862	400	36	9
Poorly inflated	567	262	24	8
Non-inflated	269	153	11	8

	Lung volume (ml)			Lung volume (%)
	Mean	SD	α = 0.05	Mean	SD	α = 0.05
Panel C
Steroids
Total lung	2198	868	0.59
Hyperinflated	674	668	0.44	31	19	0.59
Normally inflated	806	416	0.60	36	11	0.78
Poorly inflated	522	245	0.67	24	12	0.45
Non-inflated	196	213	0.01	9	11	0.02

Panel A: whole study population (n = 60); Panel B: No-Steroids group (n = 17); Panel C: Steroids group (n = 43). Each HU compartment was reported as absolute values as well as percentage of the total lung parenchyma. Data were reported as mean ± standard deviation (SD). Wilcoxon rank-sum test was used to detect statistical differences (α = 0.05); *: to mark statistically significant differences.