Development of a novel difficulty scoring system for laparoscopic liver resection procedure in patients with intrahepatic duct stones

Table 3 The multiple linear regression model calculates the constants of the variables of the coefficient

Variables	Variables category	Coefficient
Location of stones	TL	0
	TR	1107.1
Number of stones ≥ 3	No	0
	Yes	170.5
Stone located in the bile ducts of several grades	Primary bile duct	0
	Secondary bile duct	134.2
	Tertiary bile duct	181.8
Previous biliary surgery less than twice	No	0
	Yes	182.8
Distal bile duct atrophy	No	0
	Yes	137.7

TL: Type left; TR: Type right.