Table 2.

The total number of features of each dataset.

Dataset	Features	Number of features
First dataset [2]	Gender, Age, Leukocytes (WBC), Platelets, C-reactive Protein (CRP), Transaminases (AST), Transaminases (ALT), Gamma Glutamil Transferasi (GGT), Lactate dehydrogenase (LDH), Neutrophils, Lymphocytes, Monocytes, Eosinophils, Basophils	15
Second dataset (OSR dataset) [6]	White blood cells (WBC), Red blood cells (RBC), Hemoglobin (HGB), Hematocrit (HCT), Mean corpuscular volume (MCV), Mean Corpuscular hemoglobin (MCH), Mean Corpuscular hemoglobin concentration (MCHC), Erythrocyte distribution width (RDW), Platelets (PLT), Mean platelet volume (MPV), Neutrophils count (NE), Lymphocytes count (LY), Monocytes count (MO), Eosinophils count (EO), Basophils count (BA), Neutrophils count (NET), Lymphocytes count (LYT), Monocytes count (MOT), Eosinophils count (EOT), Basophils count (BAT), Prothrombin time (PTINR), Activated partial thromboplastin time (PPTR), Fibrinogen (FG), D-dimer (XDP), Glucose (GLU), Creatinine (CREA), Urea (UREA), Direct bilirubin (BILD), Indirect bilirubin (BILIN), Total bilirubin (BILT), Alanine aminotransferase (ALT), Aspartate aminotransferase (AST), Alkaline phosphatase (ALP), Gamma glutamyl transferase (GGT), Lactate dehydrogenase (LDH), Creatine kinase (CK), Sodium (NA), Potassium (K), Calcium (CA), C-reactive protein (CRP), NT-proB-type natriuretic peptide (PROBNP), Troponin T (TROPOT), Interleukin (IL), pH (PHPOC), Carbonic anhydride (CO POC), Oxygen (PO POC), Bicarbonates (BICPOC), Standard calculated bicarbonates(BISPOC), Base excess (BEPOC), Actual base excess (BEEPOC), Hematocrit (PHCTPOC), Total oxyhemoglobin (THBPOC), O saturation (SO POC), Oxyhemoglobin/Total hemoglobin (FO POC), Carboxyhemoglobin (FCOPOC), Methemoglobin (METPOC), Deoxyhemoglobin (HHBPOC), Bound O maximum concentration (BO POC), Total oxygen (CTOPOC), Inspired oxygen fraction (FIOPOC), Inspired O /O ratio (OFIPOC), Sodium (NAPOC), Potassium (KPOC), Chloride (CLPOC), Ionized calcium (CAPOC), Standard ionized calcium (CASPOC), Anion gap (ANGPOC), Glucose blood gas (GLUEMO), Lactate (LATPOC), Age (Age), Gender (Sex), COVID-suspect (patient suffers from COVID-specific symptoms at triage) (Suspect*)	34
Third dataset [9]	Patient age quantile, Hematocrit, Hemoglobin, Platelets, Red blood cells, Lymphocytes, Leukocytes, Basophils, eosinophils, Monocytes, Serum glucose, Neutrophils, Urea, C reactive protein, Creatinine, Potassium, Sodium, Alanine Transaminase, Aspartate transaminase	19

^*This is not a laboratory feature, and due to the same conditions, it has been used to compare the results of the proposed models of this study with the study [6].