Table 4. Univariate and multivariate logistic regression analyses for differentiating malignant breast tumors from benign breast tumors.
| Quantitative parameters | Univariate analysis | Multivariate analysis | |||||
|---|---|---|---|---|---|---|---|
| OR | 95% CI | P value | OR | 95% CI | P value | ||
| Arterial phase NIC | 10.4 | 4.7, 27.3 | <0.001 | 7.2 | 1.9, 26.9 | 0.01 | |
| Venous phase NIC | 3.4 | 2.1, 5.7 | <0.001 | 0.3 | 0.1, 1.3 | 0.06 | |
| Arterial phase λHu (HU/keV) | 11.4 | 5.4, 28.5 | <0.001 | 1.1 | 0.3, 4.4 | 0.90 | |
| Venous phase λHu (HU/keV) | 9.6 | 5.0, 20.8 | <0.001 | 7.2 | 1.2, 44.7 | 0.01 | |
| Arterial phase nZeff | 3.4 | 2.1, 5.8 | <0.001 | 4.2 | 1.4, 4.4 | 0.07 | |
| Venous phase nZeff | 2.3 | 1.6, 3.6 | <0.001 | 1.2 | 0.3, 4.6 | 0.80 | |
| Arterial phase attenuation (HU) | 9.3 | 4.8, 21.2 | <0.001 | 1.9 | 0.3, 11.6 | 0.49 | |
| Venous phase attenuation (HU) | 9.1 | 4.9, 19.2 | <0.001 | 4.8 | 1.1, 21.9 | 0.09 | |
NIC, normalized iodine concentration; nZeff, normalized effective atomic number; λHu, slope of the spectral Hounsfield unit curve; HU, Hounsfield unit; OR, odds ratio; CI, confidence intervals.