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Thirty-day mortality by category of troponin level at ICU admission. (A) Patients admitted to the ICU with respiratory failure attributed to COVID-19. p < 0.001 for the difference in proportions. (B) Patients admitted to the ICU with respiratory failure attributed to non-COVID-19 pulmonary infections. p = 0.032 for the difference in proportions. Legend: ULN = upper limit of normal; COVID-19 = coronavirus disease 19.
