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| Characteristics variables | NTNBC | TNBC | χ2 value | P value |
|---|---|---|---|---|
| Margin | 0.120 | 0.73 | ||
| Circumscribed | 8 | 5 | ||
| Obscured | 23 | 18 | ||
| Density | 3.548 | 0.17 | ||
| Low-density | 1 | 0 | ||
| Equal-density | 16 | 7 | ||
| High-density | 14 | 16 | ||
| Location(depth) | 5.480 | 0.065 | ||
| Anterior | 8 | 1 | ||
| Middle | 16 | 12 | ||
| Posterior | 7 | 10 |
DM, digital mammography; TNBC, triple-negative breast cancer; NTNBC, non-triple-negative breast cancer.
