Table 3.

Histopathological tumor characteristics stratified by mammographic findings

	Mass		Calcifications		Asymmetry		Distortion
	n = 777		n = 242		n = 106		n = 97
Histopathological type
DCIS	23	3% (2, 4)*	145	60% (53, 66)	9	9% (4, 16)*	3	3% (1, 9)*
Invasive carcinoma of NST	646	83% (80, 86)*	85	35% (29, 42)	78	74% (64, 82)*	69	71% (61, 80)*
ILC	54	7% (5, 9)**	5	2% (1, 5)	14	13% (7, 21)*	20	21% (13, 30)*
Other invasive carcinomas	54	7% (5, 9)	7	3% (1, 6)	5	5% (2, 11)	5	5% (2, 12)
Invasive cancer	754		97		97		94
Histological grade
Grade 1	211	28% (25, 32)	13	14% (8, 23)	26	28% (1, 38)	38	41% (31, 52)*
Grade 2	378	51% (47, 54)	42	45% (34, 55)	51	54% (44, 65)	47	51% (40, 62)
Grade 3	158	21% (18, 24)*	39	41% (31, 52)	17	18% (11, 27)*	7	8% (3, 15)*
Data not available	7		3		3		2
Lymph node status
Negative	583	80% (77, 83)	73	85% (76, 92)	74	80% (70, 87)	67	74% (64, 83)
Data not available	28	28	11		4		4
Hormonal status
ER positive	661	90% (88, 92)	75	85% (76, 92)	89	95% (88, 98)	92	100% (96, 100)*
Data not available	21		9		3		2
PR positive	532	73% (70, 76)*	47	54% (43, 65)	69	73% (63, 82)	80	87% (78, 93)*
Data not available	24		10		3		2
Mammographic diameter (mm)
Mean ± SD		15 mm ± 8*, **		36 mm ± 26		17 mm ± 16*		22 mm ± 15*
Median (IQR)		13 mm (9, 18)		30 mm (17, 50)		13 mm (9, 20)		20 mm (14, 25)
Data not available	45		7		7		4
Tumor diameter (mm)
Mean ± SD		15 mm ± 8		12 mm ± 11		16 mm ± 12		20 mm ± 15*
Median (IQR)		12 mm (9, 18)		9 mm (5, 17)		14 mm (8, 17)		15 mm (12, 22)
Data not available	11		9		0		2

Unless otherwise specified, data are the number of patients and 95% confidence interval in parentheses

DCIS ductal carcinoma in situ, NST no special type, ILC invasive lobular carcinoma, ER estrogen receptor, PR progesterone receptor, SD standard deviation, IQR interquartile range

*p < 0.001, compared with calcifications; **p < 0.001, compared with distortion