IL33 and acute respiratory distress syndrome: In order to identify the individuals presenting with the highest IL-33 levels at admission, we subdivided our polytraumatized patient collective according to the parameters PLI and ARDS, resulting in four groups: “−PLI−ARDS” combing patients without PLI and ARDS, “−PLI+ARDS” denoting those without PLI and suffering from ARDS as well as “+PLI−ARDS,” and “+PLI+ARDS” including those sustaining PLI and not developing/developing ARDS.