Table 2.
Estimated number of Korean women in each of the ACR BI-RADS breast density categories
| Age group (yr) | ACR BI-RADS breast density categorya) |
Dense breastsb) | |||
|---|---|---|---|---|---|
| Almost entirely fat | Scattered fibroglandular densities | Heterogeneously dense | Extremely dense | ||
| 40-44 | 3.09 (1.94-4.92) | 26.92 (23.16-31.17) | 82.91 (77.18-88.75) | 89.36 (83.47-95.31) | 172.25 (167.82-176.21) |
| 45-49 | 7.57 (5.49-10.40) | 44.80 (39.62-50.47) | 102.82 (96.12-109.59) | 68.91 (62.82-75.34) | 171.73 (165.79-177.24) |
| 50-54 | 16.83 (14.16-19.95) | 63.92 (59.18-68.84) | 83.81 (78.77-88.96) | 37.20 (33.31-41.42) | 121.02 (115.87-126.04) |
| 55-59 | 41.62 (35.18-48.92) | 84.54 (76.17-93.21) | 68.98 (61.01-77.48) | 16.26 (11.97-21.92) | 85.26 (76.76-94.01) |
| 60-64 | 53.35 (47.77-59.26) | 66.40 (60.46-72.51) | 36.70 (31.88-42.02) | 5.02 (3.25-7.72) | 41.71 (36.62-47.25) |
| 65-69 | 48.66 (42.68-54.87) | 48.55 (42.60-54.72) | 19.42 (15.28-24.40) | 0.85 (0.27-2.67) | 20.27 (16.05-25.32) |
| 70-74 | 50.40 (45.69-55.06) | 32.23 (27.95-36.82) | 12.88 (10.03-16.41) | 0.69 (0.22-2.16) | 13.59 (10.64-17.17) |
| 75-79 | 51.22 (46.17-56.09) | 28.07 (23.63-32.93) | 8.13 (5.63-11.60) | 0.88 (0.19-3.82) | 9.02 (6.31-12.72) |
| ≥ 80 | 64.13 (54.45-73.04) | 29.29 (21.67-38.37) | 11.49 (6.27-20.18) | NA | 11.49 (6.27-20.18) |
| 40-69c),d) | 170.91 (158.76-183.82) | 335.55 (324.22-354.72) | 389.95 (397.30-405.23) | 212.51 (206.38-230.84) | 608.30 (591.96-624.56) |
ACR BI-RADS, American College of Radiology Breast Imaging Reporting and Data System; NA, not available.
a)
Units: 10,000 women and 95% confidence intervals,
b)
Heterogeneously dense or extremly dense,
c)
The recommendations by National guidelines for breast cancer screening [27],
d)
Estimates may be different from sum of each cells due to rounding, estimated for data based on 2017 Korean Census counts.