. Author manuscript; available in PMC: 2023 Oct 1.

Published in final edited form as: J Magn Reson Imaging. 2022 Feb 15:10.1002/jmri.28111. doi: 10.1002/jmri.28111

Table 1.

MRI Exam Characteristics

	Training & Validation Sets	Testing Sets
		BI-RADS 4/BI-RADS 5 Subgroup	Consensus Reading (BI-RADS 1) Subgroup
Number of MRI Exams	4442	688	94

Number of Patients	2956	655	94

Patient Age	53 ± 11	49 ± 12	51 ± 13

BPE Category
Marked	282 (6.3%)	73 (10.6%)	8 (8.5%)
Moderate	748 (16.9%)	163 (23.7%)	12 (12.8%)
Mild	1535 (34.6%)	268 (39.0%)	25 (26.6%)
Minimal	1877 (42.3%)	184 (26.7%)	49 (52.1%)

BPE Overall Category
High	1030 (23.2%)	236 (34.3%)	20 (21.3%)
Low	3412 (76.8%)	452 (65.7%)	74 (78.7%)

BI-RADS Categories
1	841 (18.9%)	0 (0%)	94 (100.0%)
2	2451 (55.2%)	0 (0%)	0 (0%)
3	9 (0.2%)	0 (0%)	0 (0%)
4	46 (1.0%)	668 (97.1%)	0 (0%)
5	2 (0.04%)	20 (2.9%)	0 (0%)
6	1093 (24.6%)	0 (0%)	0 (0%)

Biopsy Pathology
Malignant	n/a	228 (33.1%)	n/a
High Risk		148 (21.5%)
Benign		296 (43.0%)

Abbreviations: BI-RADS, Breast Imaging Reporting and Data System; BPE, background parenchymal enhancement