Table 1.
Characteristics of women and screening mammograms included in analyses of diagnostic evaluation following positive screening mammography.
| Overall (N=35,321) | Digital index mammogram (N = 16,801) | Screen-film index mammogram (N = 18,520) | |
|---|---|---|---|
| N (%) | N (%) | N (%) | |
| Screening examination year | |||
| 2005 | 8276 (23.4) | 2354 (14.0) | 5922 (32.0) |
| 2006 | 9385 (26.6) | 4718 (28.1) | 4667 (25.2) |
| 2007 | 9058 (25.6) | 4588 (27.3) | 4470 (24.1) |
| 2008 | 8602 (24.4) | 5141 (30.6) | 3461 (18.7) |
| Age (years) | |||
| 40–49 | 12129 (34.3) | 6659 (39.6) | 5470 (29.5) |
| 50–59 | 11785 (33.4) | 5374 (32.0) | 6411 (34.6) |
| 60–69 | 6698 (19.0) | 2908 (17.3) | 3790 (20.5) |
| 70–79 | 3397 (9.6) | 1373 (8.2) | 2024 (10.9) |
| 80–89 | 1312 (3.7) | 487 (2.9) | 825 (4.5) |
| Race/ethnicity† | |||
| Non-Hispanic white | 27739 (83.9) | 13617 (84.8) | 14122 (83.1) |
| Non-Hispanic black | 1145 (3.5) | 394 (2.5) | 751 (4.4) |
| Hispanic | 1812 (5.5) | 1036 (6.5) | 776 (4.6) |
| Asian/Pacific Islander | 2256 (6.8) | 977 (6.1) | 1279 (7.5) |
| Native American/Alaska Native | 107 (0.3) | 34 (0.2) | 73 (0.4) |
| Unknown/Other | 2262 (6.4) | 743 (4.4) | 1519 (8.2) |
| Family history of breast cancer† | |||
| Yes | 5690 (19.8) | 2798 (18.2) | 2892 (21.5) |
| No | 23094 (80.2) | 12539 (81.8) | 10555 (78.5) |
| Unknown | 6537 (18.5) | 1464 (8.7) | 5073 (27.4) |
| BI-RADS* breast density† | |||
| 1 Almost entirely fat | 1970 (6.1) | 1542 (9.9) | 428 (2.6) |
| 2 Scattered fibroglandular densities | 10933 (33.8) | 6015 (38.6) | 4918 (29.3) |
| 3 Heterogeneously dense | 16537 (51.1) | 6782 (43.5) | 9755 (58.1) |
| 4 Extremely dense | 2922 (9.0) | 1236 (7.9) | 1686 (10.0) |
| Unknown | 2959 (8.4) | 1226 (7.3) | 1733 (9.4) |
| Initial BI-RADS screening assessment | |||
| 3 probably benign finding | 34 (0.1) | 13 (0.1) | 21 (0.1) |
| 0 needs additional imaging evaluation | 35208 (99.7) | 16758 (99.7) | 18450 (99.6) |
| 4 suspicious abnormality | 51 (0.1) | 25 (0.2) | 26 (0.1) |
| 5 highly suggestive of malignancy | 28 (0.1) | 5 (0.0) | 23 (0.1) |
*
BI-RADS = Breast Imaging Reporting and Data System
†
Proportions computed from among women with non-missing values