Table 1: Population studied, stratified by preoperative risk of CBDS.

History of pancreatitis, cholangitis, jaundiceAltered LFTs or bilirubin level > 1,8 mg/dLCBD > 6 mmProbability of CBDSPatients (num)

Low486486
+Intermediate83131
+Intermediate11
+Intermediate37
++High23114
++High42
++High33
+++High16