Table 2.
Classification of breast density performed by radiologists and the Quantra software (QDC).
| Density Category | Radiologists | Consensus | QDC | ||
|---|---|---|---|---|---|
| 1 | 2 | 3 | |||
| Total (1075) | |||||
| A | 166 (15.4%) | 163 (15.1%) | 218 (20.3%) | 179 (16.6%) | 123 (11.5%) |
| B | 492 (45.8%) | 462 (43%) | 367 (34.1%) | 447 (41.6%) | 425 (39.5%) |
| Non-dense | 658 (61.2%) | 625 (58.1%) | 585 (54.4%) | 626 (58.2%) | 548 (51%) |
| C | 354 (32.9%) | 392 (36.5%) | 409 (38.1%) | 385 (35.8%) | 445 (41.4%) |
| D | 63 (5.9%) | 58 (5.4%) | 81 (7.5%) | 64 (6%) | 82 (7.6%) |
| Dense | 417 (38.8%) | 450 (41.9%) | 490 (45.6%) | 449 (41.8%) | 527 (49%) |
| 40–49 (87) | |||||
| A | 4 (4.6%) | 4 (4.6%) | 5 (5.8%) | 3 (3.5%) | 3 (3.4%) |
| B | 27 (31%) | 18 (20.7%) | 15 (17.2%) | 21 (24.1%) | 14 (16.1%) |
| Non-dense | 31 (35.6%) | 22 (25.3%) | 20 (23%) | 24 (27.6%) | 17 (19.5%) |
| C | 41 (47.1%) | 54 (62.1%) | 53 (60.9%) | 50 (57.5%) | 54 (62.1%) |
| D | 15 (17.3%) | 11 (12.6%) | 14 (16.1%) | 13 (14.9%) | 16 (18.4%) |
| Dense | 56 (64.4%) | 65 (74.7%) | 67 (77%) | 63 (72.4%) | 70 (80.5%) |
| 50–69 (997) | |||||
| A | 150 (16.2%) | 148 (16%) | 196 (21.1%) | 164 (17.7%) | 114 (12.3%) |
| B | 433 (46.7%) | 410 (44.2%) | 328 (35.4%) | 395 (42.6%) | 377 (40.7%) |
| Non-dense | 583 (62.9%) | 558 (60.2%) | 524 (56.5%) | 559 (60.3%) | 491 (53%) |
| C | 297 (32%) | 323 (34.8%) | 338 (36.5%) | 318 (34.3%) | 372 (40.1%) |
| D | 47 (5.1%) | 46 (5%) | 65 (7.0%) | 50 (5.4%) | 64 (6.9%) |
| Dense | 344 (37.1%) | 369 (39.8%) | 403 (43.5%) | 368 (39.7%) | 436 (47%) |
| >70 (61) | |||||
| A | 12 (19.7%) | 11 (18%) | 17 (27.9%) | 12 (19.7%) | 6 (9.8%) |
| B | 32 (52.5%) | 34 (55.8%) | 24 (39.3%) | 31 (50.8%) | 34 (55.8%) |
| Non-dense | 44 (72.2%) | 45 (73.8%) | 41 (67.2%) | 43 (70.5%) | 40 (65.6%) |
| C | 16 (26.2%) | 15 (24.6%) | 18 (29.5%) | 17 (27.9%) | 19 (31.1%) |
| D | 1 (1.6%) | 1 (1.6%) | 2 (3.3%) | 1 (1.6%) | 2 (3.3%) |
| Dense | 17 (27.8%) | 16 (26.2%) | 20 (32.8%) | 18 (29.5%) | 21 (34.4%) |