Table 1.
Characteristics of the Cohort by Preoperative Magnetic Resonance Imaging Use, from the Breast Cancer Surveillance Consortium Linked to Administrative Claims Data, 2005–2010
| Characteristic | No MRI N = 2572 N (%) | MRI N = 503 N (%) |
|---|---|---|
| Age | ||
| 66–69 | 612 (23.8) | 159 (31.6) |
| 70–74 | 651 (25.3) | 172 (34.2) |
| 75–79 | 595 (23.1) | 100 (19.9) |
| 80–84 | 430 (16.7) | 61 (12.1) |
| 85+ | 284 (11.0) | 11 (2.2) |
| Race | ||
| White | 2105 (81.8) | 430 (85.5) |
| Black | 125 (4.9) | 13 (2.6) |
| Hispanic | 31 (1.2) | b |
| Asian | 54 (2.1) | b |
| Other | 23 (0.9) | b |
| Missing | 234 (9.1) | 38 (7.6) |
| Educational level | ||
| <High school graduate | 207 (8.0) | 20 (4.0) |
| High school graduate | 722 (28.1) | 117 (23.3) |
| >High school graduate | 1277 (49.7) | 281 (55.9) |
| Unknown | 366 (14.2) | 85 (16.9) |
| Comorbidity index | ||
| 0 | 1669 (64.9) | 359 (71.4) |
| 1 | 581 (22.6) | 104 (20.7) |
| 2 | 202 (7.9) | 29 (5.8) |
| 3+ | 120 (4.7) | 11 (2.2) |
| Year of diagnosis | ||
| 2005 | 598 (23.3) | 53 (10.5) |
| 2006 | 549 (21.3) | 72 (14.3) |
| 2007 | 461 (17.9) | 95 (18.9) |
| 2008 | 431 (16.8) | 117 (23.3) |
| 2009 | 358 (13.9) | 118 (23.5) |
| 2010a | 175 (6.8) | 48 (9.5) |
| First-degree family history of breast cancer | ||
| Yes | 593 (23.1) | 122 (24.3) |
| No | 1889 (73.4) | c |
| Unknown | 90 (3.5) | b |
| BI-RADS breast density | ||
| Nondense (almost entirely fatty or scattered fibroglandular densities) | 1138 (44.2) | 231 (45.9) |
| Dense (heterogeneously dense or extremely dense) | 855 (33.2) | 183 (36.4) |
| Unknown | 579 (22.5) | 89 (17.7) |
a
Data from 2010 included only a portion of the year; bindicates cell sizes <11; ccell value hidden so that cell sizes <11 cannot be calculated in accordance with the Medicare Data Use Agreement.
BI-RADS, Breast Imaging Reporting and Data System; MRI, magnetic resonance imaging.