PMP22 and neuropathy: When comparing with controls, CIDP patients had higher MN FR at the antecubital fossa, with an increase of 0.172, (95% CI, 0.001–0.343), p = 0.047, d-CIDP patients had higher MN FR at the mid-arm site (increase of 0.47, p = 008), and UN FR below the elbow (increase of 0.54, p = 0.038).When testing for differences between the three neuropathy groups, CIDP patients had higher FR compared to anti-MAG patients: for the MN at the antecubital fossa (increase of 0.177, (95% CI, 0.02–0.32), p = 0.023) and for the UN at the mid-arm site (increase of 0.138, (95% CI, 0.38–0.23), p = 0.007).