Table 1.
Mammographic findings at diagnosis and on prior screening mammograms stratified by review classification categories
| Total | True | Missed | Minimal signs | |||||
|---|---|---|---|---|---|---|---|---|
| n = 1225 | 100% | n = 567 | 46% | n = 266 | 22% | n = 392 | 32% | |
| Age (years) | ||||||||
| Mean ± SD | 62 years ± 5 | 62 years ± 5 | 63 years ± 5 | 62 years ± 5 | ||||
| Median (IQR) | 63 years (59, 66) | 63 years (58, 66) | 64 years (60, 67) | 63 years (59, 66) | ||||
| Mammographic density | ||||||||
| BI-RADS a + b | 810 | 66% (63, 69) | 372 | 66% (62, 70) | 178 | 67% (61, 73) | 260 | 66% (61, 71) |
| BI-RADS c + d | 415 | 34% (31, 37) | 195 | 34% (31, 39) | 88 | 33% (28, 39) | 132 | 34% (29, 39) |
| Mammographic findings at diagnosis | ||||||||
| Mass | 777 | 63% (61, 66) | 336 | 59% (55, 63) | 185 | 70% (66, 75) | 256 | 65% (60, 70) |
| Calcifications | 242 | 20% (18, 22) | 128 | 23% (19, 26) | 46 | 17% (13, 22) | 68 | 17% (14, 22) |
| Asymmetry | 106 | 9% (7, 10) | 58 | 10% (8, 13) | 15 | 6% (3, 9) | 33 | 8% (6, 12) |
| Distortion | 97 | 8% (7, 10) | 43 | 8% (6, 10) | 20 | 8% (5, 11) | 34 | 9% (6, 12) |
| Associated findings | 3 | 0.2% (0, 1) | 2 | 0.4% (0, 1) | 1 | 0.3% (0, 1) | ||
| Mammographic diameter | ||||||||
| Mean ± SD | 18 mm ± 15 | 18 mm ± 14 | 20 mm ± 15 | 17 mm ± 16 | ||||
| Median (IQR) | 14 mm (10, 21) | 14 mm (10, 20) | 16 mm (11, 23) | 14 mm (10, 21) | ||||
| Data not available | 83 | 46 | 5 | 30 | ||||
| Mammographic findings prior mammograms | ||||||||
| Mass | 134 | 20% (17, 24) | 115 | 43% (37, 49) | 19 | 5% (3, 8)* | ||
| Calcifications | 142 | 22% (19, 25) | 62 | 23% (18, 29) | 80 | 20% (17, 25) | ||
| Asymmetry | 302 | 46% (42, 50) | 66 | 25% (20, 31) | 236 | 60% (55, 65)* | ||
| Distortion | 78 | 12% (10, 15) | 23 | 9% (6, 13) | 55 | 14% (11, 18) | ||
| Associated findings | 2 | 0.3% (0, 1) | 2 | 0.5% (0, 2) | ||||
| Mammographic diameter | ||||||||
| Mean ± SD | 12 mm ± 11 | 14 mm ± 12 | 10 mm ± 9* | |||||
| Median (IQR) | 9 mm (6, 14) | 11 mm (7, 15) | 8 mm (5, 12) | |||||
| Data not available | 191 | 20 | 171 | |||||
Unless otherwise specified, data are the number of patients and 95% confidence intervals in parenthesis
SD standard deviation, IQR interquartile range
*p < 0.001, compared with missed