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CRT analysis algorithms to predict day-30 oxygen requirement in COVID-19 at ED. CRT analysis including all biomarkers identified the model including IL-6 only. The cost of misclassifying a patient who required oxygen was designated as 10 times the cost of misclassifying a patient who did not require oxygen. Cutoff point selected by the CRT analysis is shown between the parent and child nodes. The outcome prediction of the model is indicated below each terminal node.
