ENO2 and autonomic neuropathy: Further analysis of NSE levels across specific neuropathy categories revealed peripheral neuropathy only with mean of 9.05 ± 1.45 ng/mL, autonomic neuropathy only with mean of 6.91 ± 1.50 ng/mL, both peripheral and autonomic with a mean of 9.65 ± 1.27 ng/mL, and neither type with mean of 6.80 ± 1.52 ng/mL.