TABLE 1. Characteristics of the Population Selected for the Study.

Variable	Normal (n = 40)	Suspicious (n = 40)	Total Population (n = 80)
Patient age
Mean ± STD	54.9 ± 9.9	61.5 ± 8	58.2 ± 9.6
Median	53	62	57
Range	40–81	39–80	39–81
Interquartile range	48–58.7	57–67.5	50–64.7
BI-RADS breast density
a	5	3	8
b	17	21	38
c	14	15	29
d	4	1	5
BI-RADS classification
1	28	0	28
2	12	0	12
3	0	0	0
4a	0	5	5
4b	0	15	15
4c	0	17	17
5	0	3	3