INS and diabetes mellitus: Table 1 displays the median (25th and 75th percentiles) for glucose homeostasis indicators and cystatin C. Figure 2 displays the spearman coefficients of correlation between MMSE scores, cystatin C, and glucose homeostasis indicators. We noted a strong positive correlation of HOMA-IR and HOMA-β with insulin. Correlation of insulin with FBG is influenced by participants’ diabetic status (non-diabetes: r = 0.33, diabetes: r = 0.02).