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

Egyptian Journal of Radiology and Nuclear Medicine

Table 5 The diagnostic performance of FA value in differentiating between patients and controls in all levels (based on ROC curve analysis)

Disc FA	Cutoff	AUC	SE	P value	95% CI	Sens	Spec	PPV	NPV	Accuracy
All levels	≤ 0.56	0.969	0.011	< 0.001*	0.948 to 0.990	97.0	92.7	85.5	98.6	94.0
C3–4	≤ 0.533	1.000	0.000	< 0.001*	1.000 to 1.000	100.0	100.0	100.0	100.0	100.0
C4–5	≤ 0.56	0.985	0.011	< 0.001*	0.963 to 1.000	100.0	91.1	78.9	100.0	93.3
C5–6	≤ 0.521	0.992	0.009	< 0.001*	0.974 to 1.000	95.8	100.0	100.0	96.8	98.1
C6–7	≤ 0.555	0.813	0.068	< 0.001*	0.680 to 0.947	93.3	70.0	60.9	95.5	77.8

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