Fig. 2

Correlation analysis between brain FA values and HbA1c levels in various brain regions. (A-P) depict results from the left and right centrum semiovale, parietal lobe, internal capsule, corpus callosum (genu and splenium), occipital lobe, frontal lobe, temporal lobe, and hippocampus. The correlation was assessed using Pearson’s correlation coefficient (r) with corresponding 95% CI. Bayesian factor analysis (BF₀₁) and highest density intervals (HDI) were also calculated to support statistical inference. Among all regions, a significant correlation was observed in the right hippocampus (P; r = 0.23, p = 0.03), while other regions did not show statistically significant associations