From the results in Table 12, the six most critical variables for predicting the mortality or survival of COVID-19 patients were: Length of stay in the hospital, Duration in ICU, Time to ICU from Admission, Days discharged alive or death, D-dimer, and Blood pH. In addition, we also found that other features such as Age at admission, PaO2/FiO2 ratio (Pf_ratio), TropT, Ferritin, ventilation, C-reactive protein (CRP), and Symptom of Acute respiratory distress syndrome (ARDS) (Symp_Acute_Res) are also critical determinants of outcome in terms of survival or death of a patient. Here, CRP is linked to acute respiratory distress syndrome.