Numbers of patients with various criteria leading to inclusion in the study
| One criterion | Two criteria | Three criteria | |
| Dilated CBD | 11 | 9 | 9 |
| LFT elevation | 16 | 24 | 9 |
| Positive morphine provocation | 18 | 21 | 9 |
| Total | 45 | 27 | 9 |
CBD, common bile duct; LFT, liver function test.