CRP and COVID-19: After identifying the most important features for COVID-19 disease severity prediction using the LightGBM model and SHAP values and consulting with a domain expert, te following 8 features were selected: age (Age_number), oxygen saturation (Oxygen_sat), C-reactive protein (CRP), blood aspartate aminotransferase (AST), D-dimer (Ddimer), international normalized ratio (Inter_norm_ratio), creatinine (Creatinine), and platelets (Platelets).