Table 2.
Characteristics of patients included in this study and associated observed (unadjusted) sensitivity and false-positive rates of diagnostic mammography examinations*
| No. (%) of diagnostic mammograms |
Observed sensitivity, % (95% CI) | Observed false-positive rate, % (95% CI) | ||
|---|---|---|---|---|
| Patient characteristic | With cancer | Without cancer | ||
| Patient's age, y | ||||
| <40 | 122 (8.6) | 7476 (21.7) | 72.3 (63.2 to 79.8) | 4.9 (4.2 to 5.8) |
| 40–49 | 348 (24.4) | 12 063 (35.0) | 75.6 (70.1 to 80.3) | 4.2 (3.7 to 4.9) |
| 50–59 | 345 (24.2) | 7393 (21.4) | 76.3 (71.1 to 80.8) | 3.7 (3.2 to 4.3) |
| 60–69 | 242 (17.0) | 3768 (10.9) | 76.9 (71.3 to 81.7) | 3.9 (4.6 to 4.8) |
| ≥70 | 367 (25.8) | 3771 (10.9) | 77.6 (72.6 to 81.9) | 5.4 (4.6 to 6.3) |
| Time since woman's last mammography examination | ||||
| <1 y | 405 (28.4) | 9541 (27.7) | 67.6 (62.6 to 72.2) | 4.9 (4.3 to 5.6) |
| 1 to <3 y | 556 (39.0) | 15 065 (43.7) | 74.7 (69.5 to 79.3) | 3.4 (2.9 to 3.9) |
| ≥3 y | 227 (15.9) | 4108 (11.9) | 82.8 (76.5 to 87.7) | 5.2 (4.5 to 6.0) |
| No previous mammography | 236 (16.6) | 5757 (16.7) | 86.0 (80.8 to 90.0) | 5.5 (4.8 to 6.4) |
| Mammographic breast density | ||||
| Almost entirely fat | 72 (5.1) | 2247 (6.5) | 86.4 (77.5 to 92.2) | 3.2 (2.5 to 4.0) |
| Scattered fibroglandular densities | 462 (32.4) | 11 353 (32.9) | 77.1 (72.4 to 81.3) | 3.5 (3.1 to 4.0) |
| Heterogeneously dense | 690 (48.5) | 15 215 (44.1) | 75.6 (71.8 to 79.1) | 5.0 (4.5 to 5.6) |
| Extremely dense | 200 (14.0) | 5656 (16.4) | 71.3 (63.3 to 78.1) | 4.8 (4.1 to 5.8) |
| Reported presence of a breast lump | ||||
| Yes | 937 (65.8) | 16 546 (48.0) | 80.3 (77.0 to 83.2) | 5.4 (4.8 to 6.0) |
| No | 487 (34.2) | 17 925 (52.0) | 68.4 (63.4 to 73.1) | 3.4 (3.0 to 3.8) |
*
In this study, 35 895 diagnostic mammography examinations were performed on 32 587 women. CI = confidence interval.