Table 5. Recall Rate and Biopsy Rate of Each Modality According to Study Group.
| Variable | Participants, No. (%) | |||||
|---|---|---|---|---|---|---|
| Intervention group | Control group | |||||
| Total (n = 9705) | Dense breastsa | Total (n = 9508) | Dense breastsa | |||
| Yes (n = 5797) | No (n = 3908) | Yes (n = 5593) | No (n = 3915) | |||
| Recalled after first-round screening | ||||||
| Any modality positive | 1334 (13.8) | 880 (15.2) | 454 (11.6) | 813 (8.6) | 485 (8.7) | 328 (8.4) |
| Only mammography positive | 606 (6.2) | 356 (6.1) | 250 (6.4) | 663 (7.0) | 374 (6.7) | 290 (7.4) |
| Only ultrasonography positive | 558 (5.8) | 404 (7.0) | 154 (3.9) | NA | NA | NA |
| Only CBE positive | 59 (0.6) | 44 (0.8) | 15 (0.4) | 85 (0.9) | 69 (1.2) | 16 (0.4) |
| Biopsy rateb | ||||||
| Biopsy done | 538 (5.5) | 360 (6.2) | 178 (4.6) | 196 (2.1) | 127 (2.3) | 69 (1.8) |
| Only mammography positive | 107 (1.1) | 56 (1.0) | 51 (1.3) | 128 (1.4) | 77 (1.4) | 51 (1.3) |
| Only ultrasonography positive | 355 (3.7) | 255 (4.4) | 100 (2.6) | NA | NA | NA |
| Only CBE positive | 7 (<0.1) | 4 (<0.1) | 3 (<0.1) | 27 (0.3) | 22 (0.4) | 5 (<0.1) |
Abbreviations: CBE, clinical breast examination; NA, not applicable.
a
The 2 least dense categories (almost entirely fatty and scattered fibroglandular tissues) are referred to as nondense, and the 2 most dense categories (heterogeneously dense and extremely dense) are referred to as dense.
b
Indicates a need for biopsy on first-round screening. When clinically indicated, participants might have undergone 2 or more types of biopsy.