Figure 1. Comparison of serum SIRTI and IL-6 levels in the NC, MCI and AD groups. Note: a represents *P, b represents **P and c represents ***P, *P represents the comparison between AD and MCI groups; **P represents the comparison between MCI and NC groups; ***P represents the comparison between the AD and NC groups. (A) graph shows the changes in serum SIRT1 level in the three groups respectively. (B) graph shows the changes in serum IL-6 level in the three groups respectively. NC: normal control, MCI: mild cognitive impairment, AD: Alzheimer’s Disease.