Table 4: Multivariate logistic regression analysis of the risk factors for post-surgical choledocholithiasis by the Cox hazard model.
| Risk factor | Hazard　ratio | 95% CI | p-value |
| Age (over 74) | 15.24 | 1.625-142.90 | 0.017 |
| Cholecystolithiasis | 21.07 | 3.851-114.70 | < 0.01 |
| Roux-en-Y reconstruction | 9.26 | 1.403-61.06 | 0.021 |