Shown are the plotted individual values of motor nerve conduction velocities of ulnar, fibular, and tibial nerves and of sural nerve distal latency of healthy subjects, without diabetes, drawn from studied ethnic cohorts: RDNS, NPI, and Lat cohorts. Shown also is the 5th percentile regression line on height for conduction velocities and the 95th regression line for sural nerve distal latency. The percentile range difference related to age is indicated by showing the difference in a person aged 25 and 75 years. These reference values were used by us in formulating composite NC score #2 highly sensitive for the NC diagnosis of DSPN.