Table 4.

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

	Gas volume (ml)		Gas volume (%)
	Mean	SD	Mean	SD
Panel A
All patients
Total lung	1436	718
Hyperinflated	617	557	43	18
Normally inflated	580	281	40	13
Poorly inflated	203	93	14	9
Non-inflated	36	13	3	1

	Gas volume (ml)		Gas volume (%)
	Mean	SD	Mean	SD
Panel B
No-steroids
Total lung	1465	671
Hyperinflated	614	421	42	14
Normally inflated	609	275	42	11
Poorly inflated	207	99	14	7
Non-inflated	36	14	2	1

	Gas volume (ml)			Gas volume (%)
	Mean	SD	α = 0.05	Mean	SD	α = 0.05
Panel C
Steroids
Total lung	1425	743	0.71
Hyperinflated	619	607	0.48	43	20	0.49
Normally inflated	568	286	0.62	40	14	0.66
Poorly inflated	201	91	0.88	14	10	0.39
Non-inflated	36	12	0.74	3	1	0.37

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