CholeS total score = sum of points for each pre-operative factor. Possible range 0–20. Higher scores indicate higher probability that the laparoscopic cholecystectomy will take >90 minutes.

Factor	Category	Points
Age (years)	<40	0
Age (years)	≥40	1.5
Sex	Female	0
Sex	Male	1
Indication for surgery	Pancreatitis	0
Indication for surgery	Biliary colic / dyskinesia / polyp	0.5
Indication for surgery	Common bile duct (CBD) stone	2
Indication for surgery	Acalculous cholecystitis or cholecystitis	2.5
Body mass index	<25 kg/m²	0
Body mass index	25–35 kg/m²	1
Body mass index	>35 kg/m²	2
CBD diameter	Normal	0
CBD diameter	Dilated	2
Gallbladder wall	Normal	0
Gallbladder wall	Thickened	1.5
Pre-operative CT	No	0
Pre-operative CT	Yes	1.5
Planned intra-operative cholangiogram	No	0
Planned intra-operative cholangiogram	Yes	3
Number of previous surgical admissions	0	0
Number of previous surgical admissions	1–2	1
Number of previous surgical admissions	>2	2.5
ASA physical status	Class 1	0
ASA physical status	Class 2	1
ASA physical status	Class >2	2.5

CholeS Score for Duration of Laparoscopic Cholecystectomy