| Factors | Yes | No | Don’t know/not sure |
|
| n (%) | n (%) | n (%) |
| Previous Hep B vaccination | 599 (62.1) | 307 (31.8) | 59 (6.1) |
| History of surgery | 254 (26.3) | 711 (73.7) | 0 (0.0) |
| Alcohol consumption | 149 (15.4) | 816 (84.6) | 0 (0.0) |
| Blood transfusion | 445 (46.1) | 500 (51.8) | 20 (2.1) |
| Sharing of sharps | 78 (8.1) | 801 (83.0) | 86 (8.9) |
| IV drug use | 40 (4.1) | 925 (95.9) | 0 (0.0) |
| Multiple sexual partners | 521 (54.0) | 444 (46.0) | 0 (0.0) |
| Dental procedure | 298 (30.9) | 667 (69.1) | 0 (0.0) |
| Unprotected sex | 601 (62.3) | 364 (37.7) | 0 (0.0) |