ALB and susceptibility to pneumonia measurement: Abbreviations PaO2, oxygen tension; FiO2, fraction of inspired oxygen; AST, Aspartate aminotransferase; DBIL, Direct bilirubin; UV, Univariate Analysis; MV, Multivariate Analysis; HR, Hazard Ratio; CI, Confidence Interval; qSOFA, quick sequential organ failure assessment; NEWS2, National Early Warning Score 2; PSI, Pneumonia Severity Index; PCT, Procalcitonin; CRP, C-reactive protein; NLR, Neutrophil-to-lymphocyte ratio; CAR, C-reactive protein-to-albumin ratio; LCR, Lymphocyte-to-C-reactive protein ratio