ACCI	age-adjusted Charlson Comorbidity Index
AFR	albumin-fibrinogen ratio
APS	acute physiology score
ASA	American Society of Anesthesiologists physical status classification
3D-CAM	3-Minute Diagnostic Interview for CAM-defined Delirium
4AT	Four-item Acute Delirium Test
CAM	Confusion Assessment Method
CAM-ICU	Confusion Assessment Method for the Intensive Care Unit
CCI	Charlson Comorbidity Index
CHD	coronary heart disease
CONUT	Controlling Nutritional Status
CRP	C-reactive protein
DCA	decision curve analysis
DSM	Diagnostic and Statistical Manual of Mental Disorders
GNRI	Geriatric Nutritional Risk Index
ICU	intensive care unit
IL	interleukin
LIME	Local Interpretable Model-agnostic Explanation
LR	logistic regression
LSMM	low skeletal muscle mass
MCV	mean corpuscular volume
mFI	modified frailty index
MMSE	Mini-Mental State Examination
NLR	neutrophil-to-lymphocyte ratio
NRS	numerical rating scale
PACU	post-anesthesia care unit
PNI	prognostic nutritional index
POD	postoperative delirium
PROBAST	Prediction model Risk Of Bias ASsessment Tool
PWR	platelet-to-white cell ratio
RF	random forest
SAS	sedation-agitation scale
SHAP	Shapley Additive Explanations
SII	systemic immune-inflammation index
SIINI	systemic immune-inflammatory-nutritional index
SVM	support vector machine
TC	total cholesterol
TG	triglyceride
TMAO	trimethylamine N-oxide
TRIPOD	Transparent Reporting of a multivariable prediction model for Individual Prognosis Or Diagnosis
VAS	visual analog scale
VC	vital capacity
XGBoost	extreme gradient boosting