Table 1.
Characteristics of patients who underwent regular stent exchange, n (%)
| Group A (n = 35) | Group B (n = 35) | P value | |
| Stent-exchange schedule | 6 mo | 12 mo | |
| Age, yr | 82.9 (77-87) | 84.4 (76-89) | NS |
| Sex, male/female | 15/20 | 16/19 | NS |
| Periampullary diverticulum | 7 (20.0) | 8 (22.9) | NS |
| Sphincterotomy | 30 (85.7) | 29 (82.9) | NS |
| Post-ERCP pancreatitis | 1 (2.9) | 1 (2.9) | NS |
| Reason for endoscopic stone removal failure | |||
| No. of stones | 16 (45.7) | 14 (40.0) | NS |
| Size of stones | 17 (48.6) | 18 (51.4) | NS |
| Anatomical difficulty | 2 (5.7) | 3 (8.6) | NS |
| Follow-up periods, mo | 27.3 (12-40) | 26.5 (14-37) | NS |
Continuous variables are expressed as median (interquartile range). Categorical variables are expressed as numbers. ERCP: Endoscopic retrograde cholangiopancreatography; NS: Not significant.