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Kaplan–Meier survival curves of PCT, presepsin, the SOFA score, WHO disease severity, and the VACO index for predicting 30-day mortality. (A) PCT. (B) Presepsin. (C) SOFA score. (D) WHO disease severity. (E) VACO index. Abbreviations: PCT, procalcitonin; SOFA, sequential organ failure assessment; VACO, Veterans Health Administration COVID-19; HR, hazard ratio; CI, confidence interval.
