Management of endoscopic biliary stenting for choledocholithiasis: Evaluation of stent-exchange intervals

Table 3 Characteristics of patients who underwent stent exchange on demand, n (%)

Group C (n = 17)
Age, yr	84.1 (76-90)
Sex, male/female	6/11
Periampullary diverticulum	4 (23.5)
Sphincterotomy	14 (82.3)
Post-ERCP pancreatitis	0
Reasons for endoscopic stone removal failure
No. of stones	9 (52.9)
Size of stones	6 (35.3)
Anatomical difficulty	2 (11.8)
Reasons for rejecting scheduled stent exchange
Cardiovascular diseases	4 (23.5)
Stroke sequelae	4 (23.5)
Age factors	3 (17.6)
Dementia	3 (17.6)
Malignancy	3 (17.6)
Follow-up periods, mo	24.8 (14-32)

Continuous variables are expressed as median (interquartile range). Categorical variables are expressed as numbers. ERCP: Endoscopic retrograde cholangiopancreatography.