Diagnostic value of magnetic resonance diffusion tensor imaging in evaluation of cervical spondylotic myelopathy

Egyptian Journal of Radiology and Nuclear Medicine

Table 6 The diagnostic performance of ADC value in differentiating between patients and controls in all levels (based on ROC curve analysis)

Disc ADC	Cutoff	AUC	SE	P value	95% CI	Sens	Spec	PPV	NPV	Accuracy
All levels	> 1.23	0.958	0.014	< 0.001*	0.931 to 0.986	88.1	98.0	95.2	94.8	94.9
C3–4	> 1.09	1.000	0.000	< 0.001*	1.000 to 1.000	100.0	100.0	100.0	100.0	100.0
C4–5	> 1.19	0.967	0.024	< 0.001*	0.921 to 1.000	93.3	97.8	93.3	97.8	96.7
C5–6	> 1.23	0.853	0.070	< 0.001*	0.716 to 0.989	83.3	100.0	100.0	88.2	92.6
C6–7	> 1.46	0.959	0.028	< 0.001*	0.905 to 1.000	86.7	96.7	92.9	93.5	93.4

AUC area under the ROC curve, CI confidence interval of AUC, NPV negative predictive value, PPV positive predictive value, SE standard error of AUC, Sens sensitivity, Spec specificity, p value: from a test comparing the observed AUC to the null hypothesis AUC of 0.5
*Significant at p < 0.05; Sensitivity, specificity, and predictive values are expressed as percentages