TABLE 3

Median Values, Interquartile Ranges, and A_z Values for Distinction Between Benign and Malignant Pulmonary Nodules for 16 CT Features

CT features	Malignant nodule^*	Benign nodule^*	A_z value
Size	1.5 cm (1)	0.9 cm (0.7)	0.58
Shape	7 (2)	5 (3)	0.57
Lobulation	7 (2)	3 (2)	0.81
Border definition	7 (2)	6 (2)	0.59
Marginal irregularity	6 (3)	4 (3)	0.72
Spiculation	6 (3)	3 (3)	0.78
Attenuation homogeneity	6 (4)	5 (4)	0.55
Air space	2 (2)	2 (3)	0.62
Ground-glass opacity	3 (2)	2 (1)	0.60
Calcification	1 (1)	2 (1)	0.54
Pleural indentation	3 (3)	1 (2)	0.68
Satellite lesions	6 (2)	4 (5)	0.72
Vessel involvement	3 (2)	2 (1)	0.52
Pleural effusion	2 (2)	1 (1)	0.62
Lymphadenopathy	3 (2)	1 (1)	0.75
Extrathoracic malignancy^†	NA	NA	NA

↵* Data are median values, with interquartile ranges in parentheses.
↵† Only 2 nodules had values other than 0; therefore, median value and interquartile range have value of 0, which is useless and is indicated by NA (not applicable).