Results of Multivariate Logistic Regression Using All 11 Covariates
| Variable | P | Odds ratio |
| Sentinel lymphoscintigraphic pattern | <0.001 | |
| Intermediate vs. focal | 0.036 | 2.138 (1.051–4.348) |
| Serpentine vs. focal | <0.001 | 5.233 (2.378–11.516) |
| No uptake vs. focal | 0.002 | 8.074 (2.165–30.114) |
| No. of positive SLNs | 0.024 | 1.613 (1.065–2.444) |
| No. of negative SLNs | 0.185 | 1.163 (0.930–1.455) |
| Size of LN metastasis | 0.132 | |
| 2–10 vs. ≤2 | 0.032 | 3.726 (1.118–12.413) |
| 10–20 vs. ≤2 | 0.026 | 4.339 (1.187–15.855) |
| >20 vs. ≤2 | 0.032 | 5.523 (1.157–26.367) |
| Perinodal extension | 0.013 | 2.302 (1.192–4.444) |
| Size of primary breast tumor | 0.130 | 1.021 (0.994–1.049) |
| Patient age | 0.561 | 1.009 (0.979–1.040) |
| Multifocality | 0.458 | 0.705 (0.280–1.776) |
| Histologic grade | 0.653 | 0.881 (0.509–1.527) |
| Lymphovascular space invasion | 0.552 | 1.741 (0.280–10.836) |
| Estrogen receptor status | 0.419 | 1.383 (0.629–3.038) |
Data in parentheses are 95% confidence intervals.