Table 1.

Characteristics of the patient samples and etiology of malignant biliary obstruction in the studies selected

Variable	Study
	Bang et al[16]		Paik et al[15]		Park et al[14]
	EUS	ERCP	EUS	ERCP	EUS	ERCP
n	33	34	64	61	15	15
Age (yr), mean (SD)	69.4 (12.6)	69.2 (11.6)	64.8 (12.5)	68.4 (10.5)	66.8 (8)	65.4 (9.3)
Etiology of MBO	Pancreas (n = 33)	Pancreas (n = 31); pancreatic metastasis (n = 3)	Pancreas (n = 38); cholangiocarcinoma (n = 3); gallbladder (n = 4); papilla (n = 5); gastric (n = 4); duodenal (n = 2); other (n = 8)	Pancreas (n = 40); cholangiocarcinoma (n = 8); gallbladder (n = 4); papilla (n = 3); gastric (n = 2); duodenal (n = 1); hepatocellular carcinoma (n = 1); other (n = 2)	Pancreas (n = 14); cholangiocarcinoma (n = 1)	Pancreas (n = 13); metastatic lymph node (n = 2)

EUS: Endoscopic ultrasound; ERCP: Endoscopic retrograde cholangiopancreatography; MBO: Malignant biliary obstruction.