Table 1.
Characteristics of exams using digital mammography (DM) alone or in combination with digital breast tomosynthesis (DBT)
| Characteristics | Digital mammography (DM) exams* (N = 142,883) | Tomosynthesis in combination with digital mammography (DBT) exams* (N = 55,998) | ||
|---|---|---|---|---|
| n | % | n | % | |
| Age categories | ||||
| 40–49 | 37155 | 26.0 | 18668 | 33.3 |
| 50–59 | 51096 | 35.8 | 20839 | 36.4 |
| 60–74 | 54632 | 38.2 | 16941 | 30.3 |
| Race/ethnicity | ||||
| Non-Hispanic white | 116766 | 83.5 | 39697 | 72.3 |
| Non-Hispanic black | 9062 | 6.5 | 10987 | 20.0 |
| Hispanic | 9588 | 6.9 | 1572 | 2.9 |
| Asian/Pacific Islander | 2966 | 2.1 | 1455 | 2.6 |
| American Indian or Alaska Native | 170 | 0.1 | 50 | 0.1 |
| Multiple races/other race | 1255 | 0.9 | 1164 | 2.1 |
| Unknown | 3076 | 1073 | ||
| Breast density | ||||
| Almost entirely fatty (1) | 21201 | 16.3 | 5905 | 11.2 |
| Scattered fibroglandular densities (2) | 64902 | 49.8 | 25588 | 48.6 |
| Heterogeneously dense (3) | 38445 | 29.5 | 18412 | 35.0 |
| Extremely dense (4) | 5858 | 4.5 | 2721 | 5.2 |
| Unknown | 12447 | 3372 | ||
| Prior screening | ||||
| First screening exam | 11254 | 7.9 | 6471 | 11.6 |
| Subsequent screening exam | 131629 | 92.1 | 49527 | 88.4 |
| PROSPR research center | ||||
| UPenn | 2981 | 2.1 | 20240 | 36.1 |
| D-BWH | 74911 | 52.4 | 16775 | 30.0 |
| VT | 64991 | 45.5 | 18983 | 33.9 |
Abbreviations: UPenn=University of Pennsylvania, D-BWH=Dartmouth-Hitchcock health system and Brigham and Women’s Hospital, VT=University of Vermont
*
Restricted to exams read by interpreters with at least 50 DM screens and 50 DBT screens (UPenn=6, Dartmouth-BWH=27, VT=14).