“…43 Since a history of prior major depression is known to be a potent predictor of depression in the context of stress, 50 we initially tested the association of pre-sepsis substantial depressive symptoms with post-sepsis substantial depressive symptoms without adjustment. We then added three groups of potential confounding variables chosen a priori that have been found to be important in depression and general medical/critical illness-related research: 3,9,10,12,51 1) demographics (age, sex, race, education, marital status), health risk behaviors (alcohol use and smoking), and medical comorbidity (Charlson score); 2) severe sepsis episode characteristics (organ dysfunction score, hospital length of stay, intensive care unit admission, mechanical ventilation, major surgery, and dialysis); and 3) post-severe sepsis function (level of cognitive impairment and total ADL and IADL impairments) as well as non-response propensity scores.…”