| Number | Percent |
---|---|---|
Sex | ||
 Male | 51 | 96 |
 Female | 3 | 4 |
Age | Â | Â |
Median (interquartile range) | 28 | 25–32 |
Race | ||
 Mixed ancestry | 3 | 6 |
 Black African | 34 | 63 |
 Indian ancestry | 3 | 6 |
 White | 14 | 26 |
> 10 years drug use history | 30 | 56 |
Used heroin > 4 times per day | 31 | 57 |
Current pattern of heroin use for > 6 months | 47 | 87 |
Injected heroin in last year | 10 | 19 |