Table 1.
Description of women's characteristics by self-reported history of breast biopsy or aspiration at the time of 2 007 381 Breast Cancer Surveillance Consortium (BCSC) screening mammograms*
| No history of breast biopsy or aspiration (n = 1 714 281) |
Self-reported history of breast biopsy or aspiration (n = 293 100) |
Total screening examinations (n = 2 007 381) |
|
| Women and mammogram characteristics | n (%) | n (%) | n (%) |
| Age group, y† | |||
| 40–44 | 263 154 (15.4) | 23 352 (8.0) | 286 506 (14.3) |
| 45–49 | 284 425 (16.6) | 37 293 (12.7) | 321 718 (16.0) |
| 50–54 | 299 837 (17.5) | 49 928 (17.0) | 349 765 (17.4) |
| 55–59 | 236 287 (13.8) | 47 751 (16.3) | 284 038 (14.1) |
| 60–64 | 181 755 (10.6) | 39 225 (13.4) | 220 980 (11.0) |
| 65–69 | 154 151 (9.0) | 33 588 (11.5) | 187 739 (9.4) |
| 70–74 | 130 877 (7.6) | 28 332 (9.7) | 159 209 (7.9) |
| 75–89 | 163 795 (9.6) | 33 631 (11.5) | 197 426 (9.8) |
| Density† | |||
| Almost entirely fat | 155 682 (9.1) | 16 823 (5.7) | 172 505 (8.6) |
| Scattered fibroglandular | 797 857 (46.5) | 119 337 (40.7) | 917 194 (45.7) |
| Heterogeneously dense | 642 462 (37.5) | 128 957 (44.0) | 771 419 (38.4) |
| Extremely dense | 118 280 (6.9) | 27 983 (9.6) | 146 263 (7.3) |
| Months since last mammogram† | |||
| No mammogram within past 59 months | 171 446 (10.0) | 10 566 (3.6) | 182 012 (9.1) |
| 9–11 | 25 717 (1.5) | 6240 (2.1) | 31 957 (1.6) |
| 12–35 | 1 392 465 (81.2) | 262 104 (89.4) | 1 654 569 (82.4) |
| 36–59 | 124 653 (7.3) | 14 190 (4.8) | 138 843 (6.9) |
| Comparison film† | |||
| No | 255 550 (14.9) | 28 472 (9.7) | 284 022 (14.1) |
| Yes | 1 458 731 (85.1) | 264 628 (90.3) | 1 723 359 (85.9) |
| Initial BI-RADS assessment† | |||
| 1 (Normal) | 1 255 593 (73.2) | 182 938 (62.4) | 1 438 531 (71.7) |
| 2 (Benign finding) | 291 913 (17.0) | 74 147 (25.3) | 366 060 (18.2) |
| 3 (Probably benign finding)‡ | 21 833 (1.3) | 4023 (1.4) | 25 856 (1.3) |
| 3+ (Probably benign finding with immediate work-up)‡ | 6891 (0.4) | 1359 (0.5) | 8250 (0.4) |
| 0 (Needs additional imaging) | 132 453 (7.7) | 29 351 (10.0) | 161 804 (8.1) |
| 4 (Suspicious abnormality) | 4963 (0.3) | 1178 (0.4) | 6141 (0.3) |
| 5 (Highly suggestive of malignancy) | 635 (0.0) | 104 (0.0) | 739 (0.0) |
| Year of mammogram | |||
| 1996–1997 | 191 773 (11.2) | 31 340 (10.7) | 223 113 (11.1) |
| 1998–1999 | 339 844 (19.8) | 49 158 (16.8) | 389 002 (19.4) |
| 2000–2001 | 431 586 (25.2) | 65 160 (22.2) | 496 746 (24.7) |
| 2002–2003 | 469 288 (27.4) | 90 769 (31.0) | 560 057 (27.9) |
| 2004–2005 | 281 790 (16.4) | 56 673 (19.3) | 338 463§ (16.9) |
Frequency distributions for each woman and mammogram characteristics computed for screening mammograms without a self-reported biopsy history or with a self-reported biopsy history and for the total of both. BI-RADS = Breast Imaging Reporting and Data System.
All distributions differ statistically significantly between women with and without a biopsy history; P < .001, based on χ2 test (two-sided).
We separated the BI-RADS category 3 interpretations into those without and with a recommendation for additional evaluation (BI-RADS 3 and 3+, respectively).
The drop in number of screening examinations was because of a loss of data from a site that left the BCSC.