As of June 30, 2004, 14,773 questionnaires had been administered to 8,964 individuals (Table 1).
Three-quarters of participants are men (6,542/8,964) with an average age of 33. The average age of female participants is 28 (Table 1).
Educational levels are low, with only one in four (269/1,105) participants having completed high school (Table 3; 2003-04 data).
Cocaine is the injection drug most often used (88% of the 8,939 respondents had used cocaine), followed by heroin at 36% (Table 5). Cocaine is also the drug most frequently injected by 75% (6,639/8,897) of participants (Table 9).
Injection drug use varies a lot by region (Table 5). While cocaine is the most pervasive drug in all regions (84-98% of respondents in each region), heroin use is...