Table 1.
Patient characteristics by computer-aided detection (CAD) or year of mammogram*
| Patient characteristic† | Facilities that never implemented CAD |
Facilities that implemented CAD |
Total (N = 1 621 106, 684 956 women), No. (%) | ||||
| 1998–2002 (n = 635 083), No. (%) | 2003–2006 (n = 328 287), No. (%) | 1998–2002 (n = 390 543), No. (%) | 2003–2006 (n = 267 193), No. (%) | Before CAD (n = 404 310), No. (%) | After CAD (n = 253 426), No. (%)‡ | ||
| Age, y | |||||||
| 40–44 | 90 323 (14.2) | 39 734 (12.1) | 63 623 (16.3) | 36 432 (13.6) | 64 393 (15.9) | 35 662 (14.1) | 230 112 (14.2) |
| 45–49 | 101 853 (16.0) | 47 527 (14.5) | 66 488 (17.0) | 43 097 (16.1) | 67 304 (16.6) | 42 281 (16.7) | 258 965 (16.0) |
| 50–54 | 111 752 (17.6) | 55 043 (16.8) | 66 760 (17.1) | 43 949 (16.5) | 67 998 (16.8) | 42 711 (16.9) | 277 504 (17.1) |
| 55–59 | 84 166 (13.3) | 51 485 (15.7) | 51 439 (13.2) | 40 092 (15.0) | 53 644 (13.3) | 37 887 (14.9) | 227 182 (14.0) |
| 60–64 | 64 140 (10.1) | 37 515 (11.4) | 39 917 (10.2) | 30 759 (11.5) | 42 270 (10.5) | 28 406 (11.2) | 172 331 (10.6) |
| 65–69 | 58 443 (9.2) | 30 242 (9.2) | 34 949 (9.0) | 25 521 (9.6) | 37 121 (9.2) | 23 349 (9.2) | 149 155 (9.2) |
| 70–74 | 53 414 (8.4) | 26 715 (8.1) | 30 296 (7.8) | 20 933 (7.8) | 32 094 (7.9) | 19 135 (7.6) | 131 358 (8.1) |
| ≥75 | 70 992 (11.2) | 40 026 (12.2) | 37 071 (9.5) | 26 410 (9.9) | 39 486 (9.8) | 23 995 (9.5) | 174 499 (10.8) |
| Breast density | |||||||
| Almost entirely fat | 48 717 (7.7) | 21 815 (6.6) | 36 235 (9.3) | 22 794 (8.5) | 35 945 (8.9) | 23 084 (9.1) | 129 561 (8.0) |
| Scattered fibroglandular tissue | 279 472 (44.0) | 147 653 (45.0) | 178 098 (45.6) | 130 354 (48.8) | 183 681 (45.4) | 124 771 (49.2) | 735 577 (45.4) |
| Heterogeneously dense | 257 309 (40.5) | 131 485 (40.1) | 146 758 (37.6) | 98 094 (36.7) | 153 879 (38.1) | 90 973 (35.9) | 633 646 (39.1) |
| Extremely dense | 49 585(7.8) | 27 334 (8.3) | 29 452 (7.5) | 15 951 (6.0) | 30 805 (7.6) | 14 598 (5.8) | 122 322 (7.5) |
| Previous mammography | |||||||
| No previous mammogram | 31 532 (5.0) | 10 747 (3.3) | 18 816 (4.8) | 7211 (2.7) | 20 313 (5.0) | 5714 (2.3) | 68 306 (4.2) |
| 9–15 mo | 299 210 (47.1) | 160 474 (48.9) | 213 462 (54.7) | 164 324 (61.5) | 220 699 (54.6) | 157 087 (62.0) | 837 470 (51.7) |
| 16–20 mo | 74 853 (11.8) | 33 995 (10.4) | 55 665 (14.3) | 33 028 (12.4) | 57 030 (14.1) | 31 663 (12.5) | 197 541 (12.2) |
| 21–27 mo | 124 649 (19.6) | 72 409 (22.1) | 40 197 (10.3) | 24 830 (9.3) | 41 758 (10.3) | 23 269 (9.2) | 262 085 (16.2) |
| ≥28 mo | 104 839 (16.5) | 50 662 (15.4) | 62 403 (16.0) | 37 800 (14.2) | 64 510 (16.0) | 35 693 (14.1) | 255 704 (15.8) |
| Current hormone therapy user | 227 761 (35.9) | 45 774 (13.9) | 109 419 (28.0) | 49 894 (18.7) | 109 094 (27.0) | 50 219 (19.8) | 432 848 (26.7) |
*
The number of mammograms is defined by n.
†
Patient characteristics on dates of screening mammograms. Patients may have received more than one mammogram.
‡
Mammograms interpreted during the initial 3 months of CAD use were excluded.