Table 1.
Baseline characteristics of patients in the control group and the study groups
| Characteristic | Control group (n = 98) | Study group A (n = 32) | Study group B (n = 56) | P |
| Female | 44 | 14 | 40 | 0.059 |
| Male | 54 | 18 | 16 | 0.086 |
| Age, yr | 64.47 | 63.56 | 64.50 | 0.976 |
| Comorbid conditions | 68 | 24 | 40 | 0.910 |
| Diabetes mellitus type 2 | 4 | 0 | 4 | 0.529 |
| Hypertension | 24 | 10 | 6 | 0.591 |
| Ischemic heart disease | 8 | 6 | 6 | 0.399 |
| Dyslipidemia | 8 | 7 | 7 | 0.247 |
| Hypothyroidism | 0 | 0 | 4 | 0.093 |
| Hepatic cirrhosis | 4 | 0 | 4 | 0.529 |
| Normal bilirubin pre-ERCP | 20 | 16 | 14 | 0.066 |
| Previous cholecystectomy | 40 | 10 | 24 | 0.734 |
| Dilated bile duct pre-ERCP | 4 | 0 | 4 | 0.529 |
ERCP: Endoscopic retrograde cholangiopancreatography.