Incidental biliary dilation in the era of the opiate epidemic: High prevalence of biliary dilation in opiate users evaluated in the Emergency Department

Table 1 Common bile duct diameter varies with opiate use and cholecystectomy status

Cholecystectomy status	Non opiate users, mean (SD) CBD diameter in mm	Opiate users, mean (SD) CBD diameter in mm	P value
All patients	7.24 (2.28), n = 818	8.67 (1.89), n = 867	P < 0.001
Gallbladder intact (n = 814)	5.58 (1.38), n = 432	8.01 (1.83), n = 382	P < 0.001
Gallbladder absent (n = 871)	8.72 (1.86), n = 386	9.30 (1.72), n= 485	P < 0.001

SD: Standard deviation; CBD: Common bile duct.