|  |  | HIV-positive | HI-    negative | Total | 
      
        |  |  | n    = 206 (36%) | n    = 367 (64%) | N    = 573 (100%) | 
      
        | Age | (years,    mean ± SD) | 35.00    ± 7.78 | 36.31±8.42 | 35.82±8.21 | 
      
        | Education | (years,    mean ± SD) | 9.34    ± 2.36 | 9.77    ± 3.17 | 9.62    ± 2.91 | 
      
        | Age    at first drug use | (years,    mean ± SD) | 21.86    ± 6.84 | 22.70    ± 7.81 | 22.40    ± 7.48 | 
      
        | Age    at first injecting heroin | (years,    mean ± SD) | 25.25    ± 6.45 | 25.85    ± 6.44 | 25.63    ± 6.45 | 
      
        | Age    at first sexual coitus | (years,    mean ± SD) | 16.65    ± 3.34 | 16.94    ± 3.02 | 16.84    ± 3.14 | 
      
        | HIV    transmission knowledge** | (range1-7,mean±SD) | 6.37    ± 0.94 | 5.58    ± 1.24 | 5.72    ± 1.27 | 
      
        | Polydrug    use in last 6 months** | Yes | 64 (35%) | 178 (51%) | 242    (45%) | 
      
        | (n    = 534)a | NO | 120    (65%) | 172    (49%) | 292    (55%) | 
      
        | HCV** (n = 552)a | Positive | 104    (50.5%) | 41    (11%) | 428    (75%) | 
      
        |  | Negative | 102    (49.5%) | 326    (89%) | 145    (25%) | 
      
        | RuJu** (penis bead insertion) | Yes | 111    (54%) | 121    (33%) | 232    (40%) | 
      
        |  | No | 95    (46%) | 246    (67%) | 341    (60%) | 
      
        | Used    condom at last sex (n = 553)a | Yes | 54    (23%) | 72(20%) | 117    (21%) | 
      
        |  | No | 150    (77%) | 286    (80%) | 436    (79%) | 
      
        | Sexual    partner used heroin** (n = 559)a | Yes | 60(30%) | 63(18%) | 123(22%) | 
      
        |  | No | 138(70%) | 298(82%) | 436(78%) | 
      
        | Multiple    sexual partners** | Yes | 51(25%) | 143(39%) | 194(34%) | 
      
        |  | No | 155(75%) | 224(61%) | 379(66%) | 
      
        | Injected    heroin in last 6 months** | Yes | 203(99%) | 303(83%) | 506(88%) | 
      
        |  | No | 3(1%) | 64(17%) | 67(11%) | 
      
        | Shared    needle at last injection** | Yes | 61(30%) | 42(11%) | 103(18%) | 
      
        |  | No | 145(70%) | 325(89%) | 470(82%) | 
      
        | Shared    rinse water at last | Yes | 90(44%) | 57(16%) | 147(26%) | 
      
        | injection** | No | 116(56%) | 310(84%) | 426(74%) |