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Clinical manifestations, n (%)
| Clinical manifestations | Classifications | Control group | Case group | P value |
| Abdominal pain | Yes | 38 (92.7) | 41 (93.2) | 1.000 |
| No | 3 (7.3) | 3 (6.8) | ||
| Fever | Yes | 11 (26.8) | 12 (27.3) | 1.000 |
| No | 30 (73.2) | 32 (72.7) | ||
| Jaundice | Yes | 17 (41.5) | 30 (68.2) | 0.017 |
| No | 24 (58.5) | 14 (31.8) | ||
| History of biliary tract disease | Yes | 18 (43.9) | 20 (45.5) | 1.000 |
| No | 23 (56.1) | 24 (54.5) | ||
| History of biliary surgery | Yes | 7 (17.1) | 9 (20.5) | 0.785 |
| No | 34 (82.9) | 35 (79.5) |
