Table 1. Cohort characteristics.

Numbers in parentheses are percentages, unless otherwise indicated

n Peripheral Segments:	0 (n=69)	1-6 (n=190)
Age: Mean, Median (Range)	60, 59 (37-91)	60, 61 (30-90)
Method of Detection
Nonpalpable (n=144)	40 (58.0)	104 (54.7)
Palpable (n=115)	29 (42.0)	86 (45.3)
Imaging Characteristics
Calcifications (n=37)	12 (17.0)	25 (13.0)
Mass (n=173)	50 (72.0)	123 (65.0)
Asymmetry (n=34)	4 (6.0)	30 (15.0)
Negative (n=10)	1 (1.0)	9 (5.0)
Unknown (n=5)	2 (4.0)	3 (2.0)
Primary Tumor Histologic Type
Invasive ductal carcinoma (n=215)	59 (86.0)	156 (82.0)
Invasive lobular carcinoma (n=28)	7 (10.0)	21 (11.0)
Invasive mammary carcinoma (n=16)	3 (4.0)	13 (7.0)