Ice-breaking sign: A radiological sign influencing the treatment strategies for choledocholithiasis

Table 5 Radiological indices

Radiological indices	Classifications	Control group	Case group	P value
Percentage of narrowing of the proximal and distal bile duct	-	0% (0.0-20.54)	72.08% (62.50-77.78)	< 0.001
Intrahepatic bile duct dilation	Yes	37 (90.2)	43 (97.7)	0.192
	No	4 (9.8)	1 (2.3)
Proximal bile duct diameter (mm)	-	7.95 ± 2.76	11.65 ± 2.83	< 0.001
Distal bile duct diameter (mm)	-	9.0 (6.50-10.50)	3.0 (2.0-4.0)	< 0.001
Presence of a gallbladder	Yes	36 (87.8)	41 (93.2)	0.474
	No	5 (12.2)	3 (6.8)
Stone diameter (mm)	-	7.50 (6.0-8.0)	8.0 (6.0-10.0)	0.002