Percentage of DPN, TCNS, VPT and NCV in the different PFR tertile groups. Percentages of DPN, VPT and NCV in the different PFR tertile groups. (A) Percentages of DPN in the different PFR tertile groups were analyzed by χ2 test. (B) TCNS, (C) VPT, (D) NCV of MMN, (E) NCV of PMN, (F) NCV of MSN, (G) NCV of PSN in the different PFR tertile groups were, respectively, analyzed by one-way ANOVA test. DPN, diabetic peripheral neuropathy; TCNS, Toronto clinical neuropathy score; VPT, vibration perception threshold; NCV, nerve conduction velocity; MMN, median motor nerve; PMN, peroneal motor nerve; MSN, median sensory nerve; PSN, peroneal sensory nerve. **P < 0.01, ***P < 0.001.