Table 4 Diagnostic performance of each model in predicting central lymph node metastasis in the training and validation sets

Training set

Combined model

0.956

(0.928–0.984)

0.882

(0.836–0.925)

0.922

(0.886–0.958)

0.835

(0.785–0.885)

Ultrasound radiomic model

0.920

(0.880–0.956)

0.834

(0.790–0.889)

0.870

(0.824–0.914)

0.804

(0.751–0.858)

Morphological model

0.836

(0.786–0.886)

0.693

(0.631–0.755)

0.522

(0.455–0.589)

0.897

(0.856–0.938)

Validation set

Combined model

0.973

(0.951–0.995)

0.916

(0.879–0.953)

0.933

(0.899–0.967)

0.895

(0.853–0.936)

Ultrasound radiomic model

0.918

(0.836–0.967)

0.807

(0.754–0.860)

0.822

(0.771–0.874)

0.789

(0.735–0.844)

Morphological model

0.796

(0.742–0.850)

0.614

(0.548–0.680)

0.378

(0.313–0.443)

0.895

(0.854–0.936)