Table 3 Multivariate logistic regression model of risk factors associated with hepatitis B virus infection in asymptomatic volunteer blood donors in a case-control study, Karachi, Pakistan.
| Â | Adjusted odds ratio | 95 % confidence interval |
|---|---|---|
History of dental treatment | Â | Â |
   Never had dental treatment | 1.0 | - |
   Treated by dentist | 1.6 | 0.7 – 3.6 |
   Treated by un-qualified provider | 9.8 | 2.1 – 46.1 |
Number of therapeutic injection received in last five years | Â | Â |
   0 | 1.0 | - |
   1–5 | 3.3 | 1.1 – 9.6 |
   > 5 | 4.2 | 1.4 – 12.7 |
Type of syringe used for the last injection | Â | Â |
   Never had injection | 1.0 | - |
   Plastic | 1.8 | 0.5 – 6.4 |
   Glass | 9.4 | 2.6 – 34.3 |
Injury resulted in bleeding during facial shaving from barber | Â | Â |
   No | 1.0 | - |
   Yes | 2.3 | 1.1 – 4.8 |