| Type of test and diagnosis | Incidence in males | Incidence in females | Male/female risk ratio | P-value |
| Ultrasonography: | ||||
| CBD dilatation | 75% | 79% | 0.95 | 0.73 |
| CBD stone | 50% | 72% | 0.69 | 0.098 |
| ERCP: | ||||
| CBD dilatation | 83% | 87% | 0.96 | 0.67 |
| CBD stone | 67% | 83% | 0.8 | 0.17 |
| Total no. of males = 24 | ||||
| Total no. of females = 47 |