Clinical and Laboratory Data
Demographic features and comorbid conditions of the patients, the date of hospitalization, the date of symptom onset, the date of ABG sampling, the results of ABG analysis, SpO2 level measured simultaneously with ABG, the laboratory results (hemogram, C-reactive protein-CRP, D-dimer, fibrinogen and ferritin) for the same day of ABG sampling, anticoagulant therapy status, and the outcome of the disease (death, transfer to ICU, or discharge) obtained from patients’ hospital file and electronic medical record system of the hospital were recorded on a data form.