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Mean number and size (mm) of stone(s) in the 31 patients with common bile duct stones according to the predetermined level of risk
| Risk of common bile duct stones | Number, mean ± SD | Size, mean ± SD |
| Low (n = 4; 19%) | 1.5 ± 0.6 | 3.5 ± 3.9 |
| Moderate (n = 15; 58%) | 1.5 ± 0.5 | 4.2 ± 1.8 |
| High (n = 12; 50%) | 1.5 ± 0.5 | 5.6 ± 2.6 |
| Overall (n = 31; 44%) | 1.5 ± 0.5 | 4.6 ± 2.2 |
