Table 3.

Mean values and standard deviations of each objective feature for the four different types of histological classifications

Objective feature	Histological classification
	Invasive carcinoma	Noninvasive carcinoma	Fibroadenoma	Cyst
Depth–width ratio	0.71 ± 0.94	−0.48 ± 0.99	−0.50 ± 0.68	0.14 ± 0.91
Degree of indistinctness in margin	−0.75 ± 0.73	−0.17 ± 0.93	0.19 ± 0.89	0.72 ± 0.84
Homogeneity in internal echoes	0.16 ± 0.98	−0.58 ± 0.81	−0.38 ± 0.71	0.70 ± 1.05
Echo level in internal echoes	−0.47 ± 0.71	1.05 ± 0.96	0.38 ± 0.77	−0.56 ± 0.97
Echo level in posterior echoes	−0.18 ± 0.98	−0.54 ± 0.89	0.04 ± 0.89	0.44 ± 1.06
Degree of round	−0.98 ± 0.41	−0.70 ± 0.57	0.48 ± 0.72	0.85 ± 0.77
Degree of polygonal	−0.25 ± 0.76	−0.24 ± 0.76	0.08 ± 1.17	0.31 ± 1.00
Degree of lobulated	0.25 ± 1.07	−0.13 ± 0.81	0.18 ± 1.07	−0.52 ± 0.62
Degree of irregular	0.89 ± 0.96	0.85 ± 1.06	−0.57 ± 0.38	−0.67 ± 0.20