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(a) Arterial oxygen saturation (SpO2) according to the number of risk factors (age ≥ 50 years, BMI ≥ 27.4 kg/m2, lymphocyte count <1400 cells/μL, and CRP ≥ 4.0 mg/dL) in each patient at the time of hospitalization with COVID-19. (b) The proportion of patients with SpO2 < 94% according to the number of these risk factors.
