| Mode of hepatitis B contamination | Men n (%) | Women n (%) | Total n (%) |
| Surgical operation | 36 (12) | 22 (7) | 58 (19) |
| Tattoo | 1 (0) | 0 (0) | 1 (0) |
| Blood transfusion | 1 (0) | 1 (0) | 2 (1) |
| Tooth extraction | 1 (0) | 0 (0) | 1 (0) |
| Surgical operation + blood transfusion | 0 (0) | 2 (1) | 2 (1) |
| Unknown | 178 (59) | 60 (20) | 239 (79) |
| Total | 217 (72) | 85 (28) | 302 (100) |