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Frequency and type of ML model input variables (x-axis: number of studies using the input variables; y-axis: input variable). ASA: American Society of Anesthesiology; COPD: chronic obstructive pulmonary disease; CVA: cerebral vascular accident; FIO2: fraction of inspired oxygen; ICU: intensive care unit; LFT: liver function test; ML: machine learning; RBC: red blood cell; SpO2: oxygen saturation; PaO2: arterial oxygen pressure; PaCO2: arterial CO2 pressure.
