Table 1. Baseline patient characteristics.

Variables	Total (n=4,209)	Benign (n=2,410)	Malignancy (n=1,799)	P value
Age (years), median (Q1, Q3)	44 (36, 52)	40 (32, 47)	49 (43, 58)	<0.001
Height (cm), median (Q1, Q3)	158 (154, 162)	158 (154, 162)	158 (154, 162)	0.66
Weight (kg), median (Q1, Q3)	57 (55, 60)	57 (55, 60)	57 (54, 60)	0.34
BI-RADS, n [%]				<0.001
3	680 [16]	666 [28]	14 [1]
4a	1,738 [41]	1,560 [65]	178 [10]
4b	561 [13]	159 [7]	402 [22]
4c	875 [21]	25 [1]	850 [47]
5	355 [8]	0 [0]	355 [20]
Side, n [%]				0.76
Left	2,191 [52]	1,260 [52]	931 [52]
Right	2,018 [48]	1,150 [48]	868 [48]
Max, median (Q1, Q3)	18 (11, 28)	14 (10, 22)	23 (15, 34)	<0.001
Vertical, median (Q1, Q3)	14 (9, 21)	11 (8, 17)	18 (12, 25)	<0.001
Thickness, median (Q1, Q3)	9 (6, 14)	7 (5, 10)	13 (9, 17)	<0.001
Tissue composition, n [%]				<0.001
A	573 [14]	201 [8]	372 [21]
B	3,157 [75]	1,953 [81]	1,204 [67]
C	479 [11]	256 [11]	223 [12]

Q1, first quartile; Q3, third quartile; BI-RADS, Breast Imaging Reporting and Data System.