| 
      * High risk behaviors include tattoo, blood transfusion, intra venous drug use and
leech. All the results are expressed as percentage.
        | Variables | Vaccination (n=41)
 | Placebo (n=39)
 | P value |  
        | Male gender | 63.4 | 64.1 | 0.94 |  
        | Age (year) |  |  | 0.97 |  
        | <25 | 9.8 | 7.7 |  
        | 25<, 35> | 34.1 | 33.3 |  
        | 35<, 45> | 26.8 | 30.8 |  
        | 45< | 29.3 | 28.2 |  
        | BMI (Kg/m2) |  |  | 0.17 |  
        | <18 | 51.2 | 30.8 |  
        | 18<, 25> | 26.8 | 35.9 |  
        | 25< | 22.0 | 28.2 |  
        | Smoking | 9.8 | 7.7 | 0.74 |  
        | Past surgical    history | 48.8 | 46.2 | 0.81 |  
        | High risk behaviors    * | 9.8 | 0.5 | 0.17 |  
        | Family history of    hepatitis | 56.1 | 46.2 | 0.37 |  |