Comparison of Area Under the Receiver Operating Characteristic Curve (AROC) Between Individual and Summative NCS Parameters for the Cross-Cectional (Concurrent Validity) Analysis and the Longitudinal (Predictive Validity) Analysis.

Normal values for individual NCS are as follows. Sural amp≥7.2 µV for age ≤65 and ≥5.5 µV for age >65, sural CV≥40 m/s, peroneal amp≥5 µV for age ≤65 and ≥3 for age >65, peroneal CV≥40 m/s, peroneal F wave ≤59 ms for height ≥182.9 cm and ≤58 ms for height ≤182.9 cm, tibial amp≥10 µV, tibial CV≥40 m/s, tibial F wave ≤55 ms.*Two tailed p value for comparison with the AROC for the parameters with the highest AROC in concurrent and predictive analyses.†Established by the distribution in healthy control subects [23].‡Summative parameters are composed of the following: sum amplitude = sural+tibial, sum conduction velocity = sural+peroneal +tibial, sum F-wave latency = peroneal+tibial. Summed amplitude potentials are expressed in arbitrary units since sural amplitude potential is measured in microvolts and tibial amplitude potential is measured in millivolts. Amp, amplitude potential. CV, conduction velocity. F-wave, F-wave latency.