. Author manuscript; available in PMC: 2014 May 1.

Published in final edited form as: Acad Radiol. 2013 May;20(5):527–536. doi: 10.1016/j.acra.2013.01.019

Table 4.

COPD severity classification results. AUC values reported from the ROC analysis with p- values for difference in AUC with ALL feature set according to the comparison test proposed by Hanley JA and McNeil BJ (36) shown in parenthesis. Correlation results from multiple regression analysis between optimal features of density, texture, lung biomechanical features with PFT parameters and SGRQ scores

Feature Sets	AUC	FEV₁%predicted (R²)	FEV₁/FVC (R²)	SGRQ Total score (R²)
Density	0.76 (p< 10⁻⁴)	0.57	0.69	0.26
Texture	0.73 (p< 10⁻⁴)	0.57	0.70	0.30
Biomechanical	0.81 (p< 10⁻³)	0.71	0.63	0.35
ALL	0.80 (−)	0.72	0.73	0.35