| Factor of risk | Effective | Percentage |
| Sexual risk ratio (unprotected) | 211 | 23.7 |
| Circumcision | 280 | 20.2 |
| Multiple sex partners | 115 | 12.9 |
| Scarification | 99 | 11.9 |
| Dental care | 50 | 5.6 |
| Tatoo | 47 | 5.3 |
| Surgical intervention | 35 | 3.9 |
| Piercing | 25 | 2.8 |
| Accidental injury with sampling needle | 18 | 2.0 |
| Transfusion | 14 | 1.6 |
| Partner Drug addict | 7 | 0.8 |
| Invasive exposure (endoscopy with or without biopsy) | 5 | 0.6 |
| IV drug use | 3 | 0.3 |
| Mother infected with hepatitis B | 1 | 0.1 |