Abbreviation	Definition
APACHE II	Acute Physiology and Chronic Health Evaluation II
AUC	Area Under the Receiver Operating Characteristic Curve
CCI	Charlson Comorbidity Index
CFS	Clinical Frailty Scale
CI	Confidence Interval
CRP	C-Reactive Protein
EMR	Electronic Medical Record
ICU	Intensive Care Unit
IMV	Invasive Mechanical Ventilation
IQR	Interquartile Range
NLR	Neutrophil-to-Lymphocyte Ratio
OR	Odds Ratio
ROC	Receiver Operating Characteristic
SD	Standard Deviation
SOFA	Sequential Organ Failure Assessment
STROBE	Strengthening the Reporting of Observational Studies in Epidemiology