. Author manuscript; available in PMC: 2013 Oct 1.

Published in final edited form as: Acad Radiol. 2012 Oct;19(10):1241–1251. doi: 10.1016/j.acra.2012.04.020

TABLE 4.

Average Number and Percentage of Lung Regions of Interest Classified as Normal Lung Tissue, Manifesting CN, and Manifesting CLE for Computed Tomographic Scans in the Evaluation Data Set Belonging to NNE, SNE, and CLE Classes

Class	Normal		CN		CLE
Class	n	%	n	%	n	%
NNE	9407 ± 5693	65.8 ± 32.8	3098 ± 2749	30.9 ± 32.9	459 ± 470	3.3 ± 3.0
SNE	3624 ± 3280	30.2 ± 27.5	7208 ± 3612	64.6 ± 28.0	762 ± 1097	5.2 ± 5.8
CLE	3209 ± 3389	20.0 ± 16.4	3958 ± 2179	27.5 ± 14.9	7358 ± 3802	51.9 ± 28.9
P	<.001		<.001		<.001

CLE, centrilobular emphysema; CN, centrilobular nodularity; NNE, normal subjects with no emphysema; SNE, smokers with no emphysema. Data are expressed as mean ± standard deviations.

The probabilities of the null hypotheses that NNE, SNE, and CLE scans contain the same percentages of normal lung, CN, and CLE are listed in the bottom row.