Table 4.

Comparison between characteristics of B3 cases and those of benign or malignant cases

	Benign	B3	χ2	P	B3	Malignant	χ2	P
Age
≤ 50	1809	165	2.081	0.149	165	56	34.583	0.000
> 50	177	10			10	28
Pain
No	1913	164	2.93	0.087	164	76	0.88	0.35
Yes	73	11			11	8
Duct changes
No	1912	168	0.033	0.86	168	80	0.081	0.78
Yes	74	7			7	4
Lymph nodes
No	1950	170	0.943	0.33	170	81	0.097	0.76
Yes	36	5			5	3
Palpable
Yes	1727	151	0.06	0.8	151	70	0.40	0.53
No	259	24			24	14
Left/right
Left	998	92	0.35	0.56	92	40	0.56	0.46
Right	988	83			83	44
Quadrant
Areola	57	10	6.61	0.16	10	2	8.59	0.07
Upper outer	939	74			74	40
Upper inner	549	45			45	30
Lower inner	189	21			21	3
Lower outer	252	25			25	9
Echo pattern
Anechoic	169	12	2.8	0.60	12	4	2.0	0.74
Hyperechoic	113	8			8	4
Complex cystic/solid	141	13			13	3
Hypoechoic	1491	132			132	68
Heterogeneous	72	10			10	5
Reproductive age
Yes	1148	97	0.372	0.542	97	25	15.006	0.000
No	838	78			78	59
Menopause
No	1767	169	9.955	0.002	169	58	39.706	0.000
Yes	219	6			6	26
Multifocality
Unifocal	454	65	17.979	0.000	65	35	0.490	0.555
Multifocal	1532	110			110	49
Shape
Regular	1786	150	3.064	0.080	150	48	25.733	0.000
Irregular	200	25			25	36
Margin
Circumscribed	1611	145	0.319	0.572	145	29	60.137	0.000
Not circumscribed	375	30			30	55
Suspicious calcification
Absent	1864	168	1.316	0.572	168	56	41.785	0.000
Present	122	7			7	28
Vascularity
Absent/scarce	1847	142	30.870	0.000	142	53	9.937	0.002
Present	139	33			33	31