| Risk factors | Total n = 775 | Males with CHC n = 434 | Females with CHC n = 341 | p value |
| Hospital admission | 198 (25.5%) | 107 (24.7%) | 91 (26.7%) | 0.52 |
| Blood transfusion | 171 (22%) | 124 (28.6%) | 47 (13.8%) | 0.000 |
| Exposure to needle stick | 131 (17%) | 69 (15.9%) | 62 (18.2%) | 0.413 |
| Operation | 105 (13.5%) | 46 (10.6%) | 59 (17.3%) | 0.007 |
| Endoscopy | 101 (13%) | 48 (11.1%) | 53 (15.5%) | 0.069 |
| IV injection of tarter emetic | 93 (12%) | 81 (18.7%) | 12 (3.5%) | 0.000 |