Table 5.

Frequency of homogeneous emphysema in GOLD stage III/IV patients using a 30% 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	65	54	71	42
	Right	66	50	60	37
	Both	57	40	47	25
Middle lobe/lingula	Left	81	63	69	52
	Right	81	69	88	61
	Both	69	47	59	33
Lower lobe	Left	93	81	41	39
	Right	95	83	22	20
	Both	89	74	13	11
Entire lung	Left				16
	Right				8
	Both				3

HI = Heterogeneity index.

^aLobar HI <1.30.

^bSegmental HI <1.30 for all segments in the lobe of interest.

^cIntralobar HI <1.30 for all segments in the lobe of interest.

^dLobar HI <1.30; segmental HI <1.30; intralobar HI <1.30.