Table 3. Percentage of Mammograms, Percentage of Detected Cancers, and Cancer Detection Rate by Risk Group Characterized by Clinical Indication, Personal History of Breast Cancer, Time Since Diagnosis, and Age.
| Risk group (% of mammograms) [% of detected cancers] | Clinical indication | PHBC and time since diagnosis | Age, y | Mammograms, No. (%) (n = 1 878 924) | Detected cancers, No. (%) (n = 21 624) | Cancer detection rate per 1000 mammograms (95% CI) |
|---|---|---|---|---|---|---|
| Very high risk (3.1) [25.3] | Evaluation for abnormal mammogram or lumpa | PHBC, any | Any | 8030 (0.4) | 982 (4.5) | 122.3 (108.1-138.0) |
| Evaluation for abnormal mammogram or lump | No PHBC | ≥60 | 50 199 (2.7) | 4499 (20.8) | 89.6 (82.3-97.5) | |
| High risk (8.9) [29.7] | Short-interval follow-up or evaluation for symptoms other than lumpa | No PHBC | ≥60 | 35 085 (1.9) | 1668 (7.7) | 47.5 (42.4-53.3) |
| Evaluation for symptoms other than lump | PHBC, any | Any | 1833 (0.1) | 75 (0.3) | 40.9 (29.7-56.0) | |
| Evaluation for abnormal mammogram or lumpa | No PHBC | <60 | 129 539 (6.9) | 4676 (21.6) | 36.1 (33.1-39.3) | |
| Moderate risk (7.2) [9.1] | Surveillance | PHBC, ≥10 yb | Any | 58 762 (3.1) | 1063 (4.9) | 18.1 (15.9-20.6) |
| Short-interval follow-up | PHBC, any | ≥70 | 2271 (0.1) | 35 (0.2) | 15.4 (10.0-23.7) | |
| Screen, women with history of high-risk lesion | No PHBC | Any | 6381 (0.3) | 81 (0.4) | 12.7 (10.1-16.0) | |
| Short-interval follow-up or evaluation for symptoms other than lump | No PHBC | ≤60 | 42 143 (2.2) | 493 (2.3) | 11.7 (9.9-13.9) | |
| Surveillance | PHBC, <10 y | ≥70 | 26 181 (1.4) | 303 (1.4) | 11.6 (9.8-13.6) | |
| Low risk (36.7) [22.7] | Surveillance | PHBC, <10 y | <70 | 54 394 (2.9) | 410 (1.9) | 7.5 (6.5-8.7) |
| Screen, first or >1 y since last mammogramc | No PHBC | ≥50 | 465 689 (24.8) | 3466 (16.0) | 7.4 (6.9-8.0) | |
| Short-interval follow-up | PHBC, any | <70 | 4633 (0.2) | 34 (0.2) | 7.3 (4.4-12.1) | |
| Screen, annual | No PHBC | ≥70 | 163 922 (8.7) | 1002 (4.6) | 6.1 (5.6-6.7) | |
| Very low risk (44.2) [13.1] | Screen, annual | No PHBC | 50-69 | 504 484 (26.8) | 1915 (8.9) | 3.8 (3.5-4.1) |
| Screen, any | No PHBC | <50 | 325 378 (17.3) | 922 (4.3) | 2.8 (2.6-3.1) |
Abbreviation: PHBC, personal history of breast cancer.
a
Includes evaluation of clinical signs or symptoms, but symptoms are not specified.
b
Includes unknown time since breast cancer diagnosis.
c
Includes unknown time since last mammogram.