IL6 and major depressive disorder: In Model 3, IL-6 levels were significantly associated with MMSE score with adjustment for age (β = −0.15; 95% CI: −0.17 to −0.13), sex (β = −0.34; 95% CI: −0.61 to −0.06), educational level (β = 0.28; 95% CI: 0.25 to 0.32), BMI (β = −0.03; 95% CI: −0.06 to −0.01), depression (β = −0.54; 95% CI: −0.94 to −0.15), LDL Cholesterol, AST and RBC.