Table 4. Performance of each multivariate model based on MRI or PET/CT data.
|
Model-development set |
Validation set |
|||||||
|---|---|---|---|---|---|---|---|---|
|
Hosmer–Lemeshow test |
Hosmer–Lemeshow test |
|||||||
| AUC (95% CI) | χ2 | DF | P-value | AUC (95% CI) | χ2 | DF | P-value | |
| Model with MRIa |
0.811 (0.753–0.863) |
7.609 |
8 |
0.473 |
0.770 (0.682–0.846) |
3.314 |
6 |
0.768 |
| Model with PET/CTb | 0.878 (0.833–0.917) | 6.734 | 8 | 0.566 | 0.825 (0.736–0.895) | 6.107 | 6 | 0.411 |
Abbreviations: AUC=area under the receiver operating characteristics curve; CI=confidence interval; DF=degree of freedom; LNM=lymph node metastasis; MRI=magnetic resonance imaging; PET/CT=positron emission tomography/computed tomography; SCC Ag=squamous cell carcinoma antigen.
a
Variables incorporated are age, tumour size by MRI, LNM assessed by MRI, SCC Ag (categorical; <2 ng ml−1 vs ⩾2 ng ml−1).
b
Variables incorporated are age, tumour size by MRI, LNM assessed by PET/CT.