Apparent Diffusion Coefficient of Diffusion-Weighted Imaging in Evaluation of Cervical Intervertebral Disc Degeneration: An Observational Study with 3.0 T Magnetic Resonance Imaging

Table 4

The results of ROC curve and cut-off values between adjacent Pfirrmann grades.

Pfirrmann grade	Sensitivity (%)	Specificity (%)	AUC	Cut-off value (×10^−3 mm^2/sec)
I versus II	51.70	83.60	0.693	2.22
II versus III	38.20	86.40	0.600	2.14
III versus IV	60.20	70.30	0.648	1.98
IV versus V	75.00	62.50	0.714	1.80