Table 4.

Frequency of homogeneous emphysema in GOLD stage III/IV patients using a 15% heterogeneity threshold

		Frequency of homogeneous emphysema, %
		emphysema is not heterogeneous at lobar levela	emphysema is not heterogeneous at segmental levelb	emphysema is not heterogeneous within a lobec	emphysema is truly homogeneousd
Upper lobe	Left	47	33	43	15
	Right	44	29	25	9
	Both	33	21	13	3
Middle lobe/lingula	Left	53	33	56	23
	Right	51	36	65	20
	Both	35	19	34	6
Lower lobe	Left	84	70	9	9
	Right	87	68	3	2
	Both	79	57	2	2
Entire lung	Left				1
	Right				0
	Both				0

HI = Heterogeneity index.

^aLobar HI <1.15.

^bSegmental HI <1.15 for all segments in the lobe of interest.

^cIntralobar HI <1.15 for all segments in the lobe of interest.

^dLobar HI <1.15; segmental HI <1.15; intralobar HI <1.15.