Table 4.
Differential performance of combined MRI scores
| Combined characteristics | AUC (SE) | Pa | Pa | Sensitivityb (%) | Specificityb (%) |
|---|---|---|---|---|---|
| Conventional MRI | 0.72 (0.04) | Ref. | 56.86 | 81.41 | |
| Conventional + DWIc | 0.78 (0.05) | 0.003 | Ref. | 54.05 | 91.30 |
| Conventional + DCE-MRIc | 0.70 (0.05) | 0.359 | 33.33 | 96.52 | |
| Conventional + DWIc + DCE-MRIc | 0.76 (0.05) | 0.043 | 0.856 | 32.35 | 97.7 |
AUC, area under receiver operator characteristic curve; DCE, dynamic contrast-enhanced; DWI, diffusion-weighted imaging; Ref., reference; ROC, receiver operator characteristic; SE, standard error.
a
Comparison of AUC.
b
The values were generated from the ROC which maximized the sum of sensitivity and specificity.
c
DWI, DCE-MRI and both were available in 37, 39 and 34 patients with malignant parotid tumour and 92, 115 and 90 patients with benign parotid lesion, respectively. Conventional MRI was available in all included patients.