Table 1.
Characteristics of the study population
| Variable | All | Black | White | Asian | |
|---|---|---|---|---|---|
| Cases | Participants | 23,057 | 11,663 | 9824 | 1570 |
| Studies | 69,697 | 36,501 | 29,612 | 3584 | |
| Images | 451,642 | 242,911 | 185,368 | 23,363 | |
| Age (years) | <40 | 1967 (3) | 1071 (3) | 728 (2) | 168 (5) |
| 40–49 | 15,386 (22) | 8307 (23) | 5687 (20) | 1392 (39) | |
| 50–59 | 18,756 (27) | 10,256 (28) | 7472 (25) | 1028 (29) | |
| 60–69 | 19,436 (28) | 10,270 (28) | 8470 (29) | 696 (19) | |
| 70–79 | 11,502 (16) | 5436 (15) | 5790 (20) | 276 (8) | |
| 80–89 | 2496 (4) | 1084 (3) | 1388 (5) | 24 (1) | |
| 90+ | 154 (<1) | 77 (<1) | 77 (<1) | 0 (0) | |
| Imaging technique | FFDM | 35,587 | 18,158 | 15,825 | 1604 |
| FFDM + 2DS | 34,110 | 18,343 | 13,787 | 1980 | |
| BI-RADS density | A | 7945 (11) | 5261 (14) | 2599 (9) | 85 (2) |
| B | 29,102 (42) | 16,627 (46) | 11,599 (39) | 876 (25) | |
| C | 28,725 (41) | 13,087 (36) | 13,543 (46) | 2095 (58) | |
| D | 3925 (6) | 1526 (4) | 1871 (6) | 528 (15) | |
Breakdown for BI-RADS density and imaging technique is given as the number of studies. Percentages are given in brackets. All numbers above are study counts, unless explicitly stated.
FFDM full-field digital mammography, 2DS two-dimensional synthetic.