Box and Whisker plots represent median, upper median, lower median, and minimum to maximum range of serum IL 6 (A), TNF α (B) and 25-hydroxyvitamin D (C) while Bar diagram represents mean MMSE (D) among AD subjects with and without depression. Values expressed as the means ± SD are: IL 6 (pg/ml) 10.47±4.18 (AD with depression), 4.56±1.20 (AD without depression); TNFα (pg/ml) 16.84±3.88 (AD with depression), 13.48±2.92 (AD without depression); 25-hydroxyvitamin D (ng/ml) 10.22 ± 3.22 (AD with depression), 15.61 ± 4.64 (AD without depression); MMSE 10.9±4.38 (AD with depression), 19.15±1.46 (AD without depression). Statistically significant difference, p < 0.001, AD subjects with depression versus AD subjects without depression.