GB	Gallbladder
ED	Emergency department
ACC	Acute complicated cholecystitis
LOS	Length of stay
CT	Computed tomography
MDCT	Multidetector computed tomography
PTGBD	Percutaneous transhepatic gallbladder drainage
TG18	Tokyo Guideline 2018
ICD–10–CM	International Statistical Classification of Diseases, Tenth Revision, Clinical Modification
GCS	Glasgow coma scale score
CCI	Charlson comorbidity index
HU	Hounsfield units
ANOVA	Analysis of Variance
ORs	Odds ratios
CI	Confidence intervals
AUC	Area under the curve
ROC	Receiver operating characteristic
CART	Classification and regression tree
DM	Diabetes mellitus
CKD	Chronic kidney disease
FiO2	Mean fraction of inspired oxygen
WBC	White blood cell
CRP	C-reactive protein
NLR	Neutrophil-to-lymphocyte ratio
LMR	Lymphocyte-to-monocyte ratio