Table 1.

Patient characteristics

Characteristics of patients	N	%
Patient age
Mean 49 years ± 10 SD (range, 23–81)
Amount of fibroglandular tissuea
Non-dense breast	53	18.4
Dense breast	235	81.6
Background parenchymal enhancementb
Low BPE	145	50.3
High BPE	143	49.7
Menopausal status
Premenopausal	158	54.9
Postmenopausal	130	45.1
Total number of patients	288	100

BPE background parenchymal enhancement, SD standard deviation

^aNon-dense was defined as fatty and scattered amount of fibroglandular tissue and dense as heterogeneous and extreme

^bLow BPE includes minimal and mild BPE and high includes moderate and marked