Demographics of patients in preintervention (group I) and postintervention (group II) groups
| Group I | Group II | |
| Patients, n (%) | 598 | 661 |
| Female | 316 (53) | 337 (51) |
| Male | 282 (47) | 322 (48) |
| Other | 0 | 2 (1) |
| Age in years, mean±SD (range) | 60±19 (3–99) | 59±19 (12–98) |
| Total number of ERCPs, n | 842 | 885 |
| Initial ERCP | ||
| 1 | 598 | 661 |
| Follow-up (F/U) ERCPs | 244 | 224 |
| 2 | 177 | 151 |
| 3 | 47 | 53 |
| 4 | 13 | 13 |
| 5 | 4 | 6 |
| 6 | 2 | 1 |
| 7 | 1 | 0 |
| Indication for initial ERCP, n (%) | 598 | 661 |
| CBD stone | 375 (63) | 384 (58) |
| Malignant biliary stricture | 83 (14) | 108 (16) |
| Benign biliary stricture | 40 (8) | 50 (8) |
| Bile leak | 27 (5) | 20 (3) |
| Stent removal | 18 (3) | 18 (3) |
| Chronic pancreatitis | 9 (2) | 21 (3) |
| Balloon-assisted ERCP | 5 (1) | 17 (3) |
| Sphincter of Oddi dysfunction | 7 (1) | 11 (2) |
| Acute pancreatitis | 9 | 8 |
| Occluded stent | 5 | 6 |
| Ampullectomy | 7 | 4 |
| Mirizzi’s syndrome | 0 | 4 |
| Pancreatic leak | 5 | 4 |
| Cholangioscopy | 1 | 2 |
| Postsphincterotomy bleed | 1 | 2 |
| Pancreatitis prophylaxis | 2 | 1 |
| Unclear | 1 | 1 |
| Abdominal pain | 1 | 0 |
| Recurring pancreatitis | 2 | 0 |
| Intervention during F/U ERCP, n (%) | 244 | 224 |
| Stent removal | 126 (52) | 91 (41) |
| Stent replacement | 61 (25) | 39 (17) |
| Stent placement | 28 (11) | 48 (21) |
| Stone extraction | 8 (3) | 11 (5) |
| No intervention | 15 | 12 (5) |
| Dilation | 1 | 9 |
| Failed cannulation | 1 | 9 |
| Sphincterotomy only | 4 | 3 |
| Brushings/biopsy | 0 | 1 |
| Rendezvous ERCP | 0 | 1 |
CBD, common bile duct; ERCP, endoscopic retrograde cholangiopancreatography.