HIV-non-infected IDUs (N=19) HIV-infected IDUs (N=10)
Duration of IDU (years, SD) 13.5 (8.7) 19.6 (14.3)
Frequency of injection (#/mo) 160.9 (219.7) 147.1 (127.4)
Drugs injected (%)    
     Heroin 89.5 100
     Cocaine 63.2 90
     Speedball* 47.4 80
     Other* 36.8 10
Shared needles/syringes (%)* 57.9 20
Shared other paraphernalia (%) 63.2 70
Non-injecting drug use (%)    
     Heroin* 10.5 50
     Cocaine/crack 26.3 40
     Methadone 73.7 70
     Other drugs 63.2 90
Table 2: Injection & non-injection behaviours by HIV-non-infected vs. HIV-infected IDUs (prior 30 days), * p<0.05, Note: Significance tests used: Fisher’s exact test for categorical variables and 2-tailed t-test for continuous variables