Fig. 2

FBG concentration and its changes for the 32 patients receiving VNS treatment. a FBG levels at baseline, 8, and 12 months of long-term follow-up. b Changes in FBG levels at 8- and 12-month follow-up in the study subjects (N = 32). Significant differences were noted in FBG concentrations for patients receiving VNS treatment at both 8 months’ (p = 0.001) and 12 months’ (p = 0.002) follow-up compared to baseline values