Table 1.
Characteristics of mammograms interpreted by BCSC radiologists.1
| Interpreted by any of 468 BCSC Radiologists | Interpreted by one of 195 BCSC Radiologists who completed the FAVOR survey | |||
|---|---|---|---|---|
| Screening exams | Diagnostic exams | Screening exams | Diagnostic exams | |
| Patient characteristics at exam time | n = 2,234,947 | n = 196,164 | n = 1,231,794 | n = 112,128 |
| Age at exam, % | ||||
| < 40 | 3.6 | 18.0 | 3.3 | 17.3 |
| 40-49 | 28.8 | 29.3 | 28.1 | 29.1 |
| 50-59 | 30.9 | 24.4 | 31.0 | 24.8 |
| 60-69 | 19.5 | 14.6 | 19.9 | 14.9 |
| 70+ | 17.3 | 13.6 | 17.7 | 13.9 |
| BI-RADS® breast density, % | ||||
| Almost entirely fat (<25% fibroglandular) | 6.7 | 4.8 | 7.7 | 5.6 |
| Scattered fibroglandular tissue (25%-50%) | 36.3 | 26.8 | 38.1 | 27.2 |
| Heterogeneously dense (50%-75%) | 32.2 | 29.3 | 33.4 | 30.2 |
| Extremely dense (>75%) | 6.6 | 9.3 | 7.0 | 10.0 |
| Unknown | 18.1 | 29.7 | 13.8 | 26.9 |
| Prior mammography, % | ||||
| < 3 years | 79.0 | 69.7 | 78.3 | 69.9 |
| 3 years or more | 7.8 | 7.2 | 7.9 | 7.1 |
| No prior mammogram | 4.4 | 10.3 | 4.2 | 9.4 |
| Unknown | 8.8 | 12.8 | 9.6 | 13.6 |
| Comparison film available at time of exam, % | ||||
| No | 9.7 | 28.4 | 10.3 | 28.1 |
| Yes | 77.8 | 54.8 | 77.5 | 56.0 |
| Unknown | 12.5 | 16.8 | 12.1 | 15.8 |
| Family history of breast cancer, % | ||||
| No | 81.8 | 78.6 | 81.2 | 78.4 |
| Yes | 14.2 | 15.5 | 14.8 | 16.3 |
| Unknown | 4.0 | 5.9 | 4.0 | 5.3 |
| Current hormone therapy use, % | ||||
| No | 72.5 | 76.8 | 71.7 | 75.9 |
| Yes | 18.1 | 12.3 | 17.3 | 11.6 |
| Unknown | 9.4 | 10.9 | 11.1 | 12.6 |
| Self-reported breast symptoms, % | ||||
| None | 91.3 | 36.6 | 91.1 | 38.9 |
| Pain | 1.6 | 8.5 | 1.8 | 8.4 |
| Other not including pain | 1.9 | 8.8 | 1.6 | 8.1 |
| Nipple discharge | 0.0 | 2.5 | 0.0 | 2.4 |
| Lump | 0.0 | 35.4 | 0.0 | 33.3 |
| Unknown | 5.3 | 8.2 | 5.4 | 9.0 |
Percentages shown here are calculated among all screening mammograms and all diagnostic mammograms read by the 468 Breast Cancer Surveillance Consortium (BCSC) radiologists (first two columns), or the subset of 195 BCSC radiologists who responded to the Factors Associated with Variability of Radiologists (FAVOR) survey (second two columns), between January 2001 and December 2006. The cohort of 468 BCSC radiologists reviewed screening mammograms from 1,029,363 individual women and diagnostic mammograms from 154,167 women. The subset of 195 radiologists who responded to the FAVOR survey reviewed screening mammograms from 692,102 individual women, and diagnostic mammograms from 92,661 women. Women who had both screening and diagnostic mammograms contribute information to both the screening and diagnostic cohort summaries above. 76,325 women had at least one screening and one diagnostic mammogram interpreted by a BCSC radiologist. Of these, 38,044 women had at least one screening and at least one diagnostic mammogram interpreted by FAVOR study radiologists.