| All women (n = 89,855) | No breast cancer (n = 89,712) | Breast cancer (n = 143) |
---|---|---|---|
Age (years)* | 43.5 (8.7) | 43.5 (8.7) | 46.6 (9.2) |
Menopausal status | Â | Â | Â |
 Premenopausal | 72,620 (80.8) | 72,512 (80.8) | 108 (75.5) |
 Postmenopausal | 16,953 (18.9) | 16,920 (18.9) | 33 (23.1) |
 Missing | 282 (0.3) | 280 (0.3) | 2 (1.4) |
Body mass index category | Â | Â | Â |
 Underweight | 6,603 (7.4) | 6,596 (7.4) | 7 (4.9) |
 Normal | 51,990 (57.9) | 51,913 (57.9) | 77 (53.9) |
 Overweight | 15,763 (17.5) | 15,742 (17.6) | 21 (14.7) |
 Obese | 15,395 (17.1) | 15,358 (17.1) | 37 (25.9) |
 Missing | 104 (0.1) | 103 (0.1) | 1 (0.7) |
Education level | Â | Â | Â |
 < College graduate | 26,018 (29.0) | 25,972 (29.0) | 46 (32.2) |
 ≥ College graduate | 58,191 (64.8) | 58,105 (64.8) | 86 (60.1) |
 Unknown | 5,646 (6.3) | 5,635 (6.3) | 11 (7.7) |
First-degree family history of breast cancer | Â | Â | Â |
 Yes | 2,410 (2.7) | 2,407 (2.7) | 3 (2.1) |
 No | 87,171 (97.0) | 87,032 (97.0) | 139 (97.2) |
 Unknown | 274 (0.3) | 273 (0.3) | 1 (0.7) |
History of benign breast disease†|  |  |  |
 Yes | 7,885 (8.8) | 7,867 (8.8) | 18 (12.6) |
 No | 74,141 (82.5) | 74,029 (82.5) | 112 (78.3) |
 Unknown | 7,829 (8.7) | 7,816 (8.7) | 13 (9.1) |
Five-year risk based on Gail model (%) | Â | Â | Â |
 < 0.83% | 88,972 (99.0) | 88,831 (99.0) | 141 (98.6) |
 0.83–1.66% | 593 (0.7) | 593 (0.7) | 0 (0) |
 ≥ 1.67% | 5 (0.0) | 5 (0.0) | 0 (0) |
 Unknown | 285 (0.3) | 283 (0.3) | 2 (1.4) |
Equipment (%) | Â | Â | Â |
 Senographe, GE | 87,686 (97.6) | 87,545 (97.6) | 141 (98.6) |
 Selenia, Hologic | 2,169 (2.4) | 2,167 (2.4) | 2 (1.4) |
Mammography density | Â | Â | Â |
 A. Almost entirely fatty | 1,035 (1.2) | 1,033 (1.2) | 2 (1.4) |
 B. Scattered fibroglandular tissue | 10,528 (11.7) | 10,512 (11.7) | 16 11.2) |
 C. Heterogeneously dense | 40,943 (45.6) | 40,877 (45.6) | 66 (46.2) |
 D. Extremely dense | 37,349 (41.6) | 37,290 (41.6) | 59 (41.3) |
AI-driven mammographic density | Â | Â | Â |
 A. Almost entirely fatty | 501 (0.6) | 500 (0.6) | 1 (0.7) |
 B. Scattered fibroglandular tissue | 16,771 (18.7) | 16,748 (18.7) | 23 16.1) |
 C. Heterogeneously dense | 55,947 (62.3) | 55,856 (62.3) | 91 63.6) |
 D. Extremely dense | 16,636 (18.5) | 16,608 (18.5) | 28 (19.6) |