Table 1.
Comparisons of clinical and US morphological features in training and validation cohorts
| Characteristic | Training
cohort (n = 253) |
Testing
cohort (n = 107) |
P |
|---|---|---|---|
| Agea | 44.23 ± 13.14 | 42.71 ± 13.75 | 0.323 |
| Tumor size | |||
| <3 cm | 205 (81.0%) | 89 (83.2%) | 0.630 |
| >3 cm | 48 (19.0%) | 18 (16.8%) | |
| Shape | |||
| Oval or round | 128 (50.6%) | 56 (52.3%) | 0.762 |
| Irregular | 125 (49.4%) | 51 (47.7%) | |
| Margin | |||
| Well circumscribed | 126 (49.8%) | 64 (59.8%) | 0.642 |
| Non-circumscribed | 127 (50.2%) | 43 (40.2%) | |
| Orientation | |||
| Parallel | 213 (84.2%) | 88 (82.2%) | 0.061 |
| Non-parallel | 40 (15.8%) | 9 (17.8%) | |
| Echotexture | |||
| Hypoechoic | 198 (78.3%) | 91 (85.0%) | 0.234 |
| Heterogeneous | 55 (21.7%) | 16 (15.0%) | |
| Posterior echo feature | |||
| None | 178 (70.4%) | 79 (73.8%) | 0.505 |
| Enhancement | 75 (29.6%) | 28 (26.2%) | |
| BI-RADS category | |||
| 3 | 71 (28.1%) | 32 (29.9%) | 0.673 |
| 4A | 66 (26.1%) | 26 (24.3%) | |
| 4B | 61 (24.1%) | 31 (29.0%) | |
| 4C | 34 (13.4%) | 13 (12.1%) | |
| 5 | 21 (8.3%) | 5 (4.7%) | |
| Rad-scorea | −0.07 ± 2.06 | 0.25 ± 1.95 | 0.160 |
NOTE: Unless otherwise noted, data are shown as the number of patients, with the percentage in parentheses.
a
Data are means ± standard deviations.