Patients with type 2 diabetic peripheral neuropathy were categorized into the diabetic peripheral neuropathy group with hypoglycemic or lipid-lowering drugs group.The group treated with specific drug,like hypoglycemic or lipid-lowering drugs.

Patients with type 2 diabetic peripheral neuropathy were categorized into the diabetic peripheral neuropathy group without hypoglycemic or lipid-lowering drugs group.No hypoglycemic or lipid-lowering drugs were used in this group.

Patients with type 2 diabetes mellitus but not with diabetic peripheral neuropathy were distributed into the Diabetic group with hypoglycemic or lipid-lowering drugs group. group.The group treated with specific drug,like hypoglycemic or lipid-lowering drugs.

Patients with type 2 diabetes mellitus but not with diabetic peripheral neuropathy were distributed into the Diabetic group without hypoglycemic or lipid-lowering drugs group.No hypoglycemic or lipid-lowering drugs were used in this group.

patients treated with hypoglycemic Agents(metformin)

The nerve conduction examination was conducted at a room temperature of 24℃, with the legs warmed using an electric heating pad for at least 10 minutes to achieve a skin temperature of 32-35℃. The nerve conduction velocities and nerve conduction amplitudes were measured for both sides of the upper and lower limbs, including motor and sensory branches of the median nerve; motor and sensory branches of the ulnar nerve; motor branch of peroneal nerve; motor branch of the tibial nerve; sensory branch of the superficial peroneal nerve. In addition, both sides of the tibial nerve F-wave were recorded, and the lower one was regarded as the final F-wave. Slowed/blocked nerve conduction was defined as more than 2.5 standard deviation below the control nerve conduction threshold. Nerve conduction is defined as abnormal when two or more nerve abnormalities are detected.

When any of the elements of the screening process -- symptoms, signs, or abnormal nerve conduction parameters --was abnormal, medical records would be scrutinized to see if these participants had accepted a previous diabetic peripheral neuropathy diagnosis by a specialist.