Table 3.

Comparison of US and NCS: statistical values

Statistical parameter	US	NCS
Sensitivity(%)	84.6 (76.2–90.9)	92.3 (85.4–96.6)
Specificity(%)	81.8 (48.2–97.7)	90.9 (58.7–99.8)
Positive predictive value(%)	97.8 (92.2–99.7)	99.0 (94.4–100.0)
Negative predictive value(%)	36.0 (18.0–57.5)	55.6 (30.8–78.5)
Positive likelihood ratio(%)	4.7 (1.3–16.4)	10.2 (1.6–65.9)
Negative likelihoodratio(%)	0.2 (0.1–1.3)	0.1 (0–0.2)

NCS nerve conduction studies, US ultrasonography