ML	Machine learning
FMC	Flinders Medical Centre
EMRs	Electronic medical records
HFRS	Hospital Frailty Risk Score
SES	Socioeconomic status
IRSD	Index of Relative Socioeconomic Disadvantage
CCI	Charlson Comorbidity Index
CHF	Congestive heart failure
C-RP	C-reactive protein
NLR	Neutrophil–lymphocyte ratio
ED	Emergency department
LASSO	Least Absolute Shrinkage and Selection Operator
LOS	Length of hospital stay
RF	Random forest
XGBoost	Extreme Gradient Boosting
ANN	Artificial neural network
AUC	Area under the receiver operating characteristic curve