Table 2. Pancreatobiliary measurements in patients with opium addiction (OA) and control (C) patients .

Variable	Group	Mean (mm)	SD	P value
GB wall thickness	OA	2.6	0.8	0.023
	C	2.4	0.7
Mid-CBD diameter	OA	7.3	2.8	< 0001
	C	4.5	1.5
Distal CBD diameter	OA	4.2	1.7	< 0.001
	C	3.0	1.0
PD diameter (head)	OA	3.3	1.2	< 0.001
	C	2.2	0.7
PD diameter (body)	OA	1.8	0.6	0.042
	C	1.6	0.6
Ampulla of Vater surface area	OA	39.1	19.0	< 0.001
	C	28.2	13.5
Portal vein diameter	OA	10.5	2.1	< 0.001
	C	8.9	2.1

Abbreviations: GB, gallbladder; CBD, common bile duct; PD, pancreatic duct.