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Baseline characteristics of the patients
| Group A (n = 27) | Group B (n = 28) | |
| Gender (M/F) | 10/15 | 11/14 |
| Mean age (yr)1 | 70.3 ± 8.7 | 69.8 ± 9.2 |
| Mean diameter of stone (mm)1 | 20.8 ± 4.1 | 21.3 ± 5.2 |
| Mean No. of stones1 | 2.2 ± 1.3 | 2.3 ± 1.2 |
| Mean diameter of bile duct (mm)1 | 21.4 ± 6.3 | 20.5 ± 5.7 |
| Periampullary diverticulum (%) | 9 (33.3) | 10 (35.7) |
| Previous cholecystectomy (%) | 9 (33.3) | 7 (25) |
| Distal CBD tapering (%) | 11 (41) | 10 (36) |
mean ± SD; CBD: Common bile duct.
