IL6 and infection: The influence of the infection focus was examined for the parameters: APACHE II score day 1, SOFA score day 1, CRP day 1, CRP day 1–day 3, IL-6 day 1, bilirubin day 1, AST day 1, creatinine day 1, need of renal replacement therapy day 1, age, sex, body mass index (BMI), need of invasive ventilation day 1, norepinephrine > 1.0 mg/h day 1, in-hospital mortality, estimated mortality based on APACHE II score day 1, and group.