Table 1: Patient characteristics.

Group A Group B value Age 68.8 ± 9.2 69.6 ± 9.7 0.815 Gender        Male : female 4 : 5 27 : 10 0.127 Symptom        Jaundice 6 29 0.460  Abdominal pain 7 8 0.001  Fever 2 5 0.609  Anorexia 0 10 0.172  Asymptomatic 2 5 0.609 Associated disease        GS 9 7* <0.01  Cholangitis 2 4 0.581

*following cholecystectomy in one case.