Mean scores of severity systems between patients who did and did not meet the outcome criteria. (a) Acute Physiology and Chronic Health Evaluation (APACHE) II score. (b) Mortality in Emergency Department Sepsis (MEDS) score. (c) Predisposition, infection, response, and organ dysfunction (PIRO) score. No, patients did not meet the outcome criteria; yes, patients met the outcome criteria. MOD, multiple organ dysfunction.