--is designed to measure the responses of larger-caliber, myelinated sensory and motor nerves. All motor nerves are myelinated, and so are the sensory nerves that sense position, vibration, and mechanical touch.

There are UNmyelinated sensory nerves--the small fiber ones--that sense temperature and pain. These are too small to be measured by standard nerve conduction study techniques. So one could have a small-fiber sensory syndrome and be symptomatic and still show "normal" on a nerve conduction study. Such people tend to have pain and paratheses ("abnormal sensations without source") as paramount symptoms. But one can have a sensory syndrome of the larger fibers that disrupts the other sensory modalities (and often there are symptoms of numbness, or prickles, or jolts, or tingles). Or these can be combined.

The results of the study seems to show that at least in some anatomical areas you've having a problem with the larger sensory nerves, which is consistent with a disruption to the myelin sheathing (myelin is the fatty covering of large nerves that helps sustain and amplify signal impulses).