IL6 and major depressive disorder: Mean levels of inflammation biomarkers at age 18 among participants with MDD risk scores were as follows: CRP mean = 2.32 mg/L (SD = 3.67), IL-6 mean = 1.22 pg/mL (SD = 1.24), and suPAR mean = 3.21 ng/mL (SD = 0.91).