Figure 1: Correlation between HbA1c and hippocampal atrophy index (HAI) and whole brain atrophy rate (WBAR). Open circles are non-diabetic subjects and closed circles diabetic patients. HbA1c levels were correlated with neither HAI (r2=0.003, p=0.745) nor WBAR (r2=0.006, p=0.512) in diabetic patients, while they were correlated with HAI (r2=0.416, p=0.013), but not WBAR (r2=0.016, p=0.300) in non-diabetic subjects.