“…Several authors have developed similar approaches involving different variables in the prediction of mortality; some of them include dyspnoea,41 42 BUN, platelet count,42 43 sex,42 age,41 43–46 cough,41 weight,44 cardiovascular disease,41 orotracheal intubation,41 and pleural effusion,41 44 respiratory rate,42 fraction of inspired oxygen,42 blood oxygen saturation42 43 pH,42 aspartate aminotransferase levels,42 estimated glomerular filtration rate,42 lymphocyte count,44 47 WCC,41 43 creatine46 lactic acid47 and serum calcium 47. However, most of their studies did not focus on the interaction of such variables on hospital admission, and their interpretability by clinicians is difficult.…”