Sample characteristics
| Variable | First participation (n=264) |
|---|---|
| Mean age, years (SD; range) | 39.1 (±8.48; 20–58) |
| Gender (%) | |
| Male | 148 (56) |
| Female | 113 (43) |
| Transgender | 3 (1) |
| Australian-born (%) | 209 (79) |
| Completed 4+ years high school (%) | 144 (55) |
| English speaking background (%) | 215 (81) |
| Government benefit main source of income (%) | 255 (97) |
| Indigenous identity (%) | 75 (28) |
| History of adult or juvenile imprisonment (%) | 193 (73) |
| Sexual identity (%) | |
| Heterosexual | 236 (89) |
| Other | 28 (11) |
| Type of opioid substitution therapy (OST) (%) | |
| Methadone | 210 (80) |
| Buperenorphine | 23 (9) |
| Buprenorphine/naloxone | 31 (12) |
| Current episode of OST ≤2 years (%) | 168 (64) |
| History of injecting drug use (%) | 246 (93) |
| Mean age of onset of injecting (SD; range) | 19.3 (±5.30; 10–41) |
| History of mental health diagnosis (%) | 156 (59) |
| Currently prescribed mental health medication (%) | 84 (32) |
| Risky/harmful alcohol consumption (AUDIT score 8+) (%) | 107 (41) |
| Dependent on main illicit drug by SDS (%) | 140 (53) |
SDS, Severity of Dependence Scale.