TABLE 4.

Consistency between nnU-Net model and physicians in evaluating carotid artery stenosis degree in training and validation sets.

No. (%)	Assessed by nnU-Net model					Kappa coefficient	p value
		No stenosis	Mild stenosis	Moderate stenosis	Severe stenosis
Training set (N = 70)
Assessed by physicians	No stenosis	31 (44.3)	1 (1.4)	0 (0.0)	0 (0.0)	0.874	<0.001
	Mild stenosis	0 (0.0)	16 (22.9)	1 (1.4)	0 (0.0)
	Moderate stenosis	0 (0.0)	3 (4.3)	12 (17.1)	0 (0.0)
	Severe stenosis	0 (0.0)	0 (0.0)	1 (1.4)	5 (7.1)
Validation set (N = 23)
Assessed by physicians	No stenosis	13 (56.5)	0 (0.0)	0 (0.0)	0 (0.0)	0.930	<0.001
	Mild stenosis	0 (0.0)	3 (13.0)	1 (4.3)	0 (0.0)
	Moderate stenosis	0 (0.0)	0 (0.0)	3 (13.0)	0 (0.0)
	Severe stenosis	0 (0.0)	0 (0.0)	0 (0.0)	3 (13.0)