Multivariable logistic regression: ORs and 95% CIs for HCV infection scoring by age groups
| <25 years (N=2686) | 25–29 years (N=2291) | 30–39 years (N=3563) | ≥40 years (N=2122) | |||||||||
| OR (p) | β×10 | Score | OR (p) | β×10 | Score | OR (p) | β×10 | Score | OR (p) | β×10 | Score | |
| Sex | ||||||||||||
| Male | 1 | – | 0 | 1 | 1 | – | ||||||
| Female | 1.4 | 3.4 | 3 | 1.5 (<0.001) | 4.1 | 4 | 1.4 (0.002) | 3.3 | 3 | |||
| Indigenous | ||||||||||||
| No | – | – | – | – | – | 1 | – | – | ||||
| Yes | 1.3 (0.04) | 2.8 | 3 | – | ||||||||
| Ever been in prison? | ||||||||||||
| No | 1 | 1 | 0 | 1 | 1 | 1 | ||||||
| Yes | 2.2 (<0.001) | 7.8 | 8 | 2.8 (<0.001) | 10.2 | 10 | 1.9 (<0.001) | 6.4 | 6 | 1.4 (0.003) | 3.4 | 3 |
| Years of injecting | ||||||||||||
| <5 | 1 | – | 0 | 1 | 1 | |||||||
| 5–9 | 2.0 (<0.001) | 6.8 | 7 | 1.7 (<0.001) | 5.5 | 6 | 1.9 (<0.001) | 6.5 | 7 | 1.5 (0.149) | 3.7 | 4 |
| ≥10 | 3.1 (<0.001) | 11.1 | 11 | 2.4 (<0.001) | 8.9 | 9 | 3.6 (<0.001) | 12.7 | 13 | 4.6 (<0.001) | 15.3 | 15 |
| Drug last injected | ||||||||||||
| Amphetamine/methamphetamine | 1 | – | 0 | 1 | 1 | – | 1 | |||||
| Morphine | 2.3 (<0.001) | 8.3 | 8 | 1.7 (0.009) | 5.5 | 6 | 1.9 (<0.001) | 6.7 | 7 | 1.9 (<0.001) | 6.7 | 7 |
| Others* | 2.0 (<0.001) | 6.7 | 7 | 1.6 (0.010) | 4.7 | 5 | 1.8 (<0.001) | 5.9 | 6 | 1.5 (0.053) | 4.0 | 4 |
| Heroin | 3.0 (<0.001) | 11.1 | 11 | 2.7 (<0.001) | 10.0 | 10 | 3.0 (<0.001) | 10.7 | 11 | 2.5 (<0.001) | 9.0 | 9 |
| Cocaine | 6.4 (<0.001) | 18.6 | 19 | 3.6 (<0.001) | 12.7 | 13 | 3.0 (<0.001) | 10.9 | 11 | 3.6 (<0.001) | 12.8 | 13 |
| Methadone | 3.3 (<0.001) | 11.3 | 11 | 3.4 (<0.001) | 12.2 | 12 | 3.0 (<0.001 | 11.0 | 11 | 3.1 (<0.001) | 11.3 | 11 |
| Buprenorphine | 3.2 (0.003) | 11.4 | 11 | 2.8 (0.004) | 10.4 | 10 | 2.8 (0.001) | 10.2 | 10 | 1.9 (0.141) | 6.2 | 6 |
| Drug injecting behaviours last month | ||||||||||||
| Injecting frequency | ||||||||||||
| Less than daily | 1 | – | 0 | 1 | ||||||||
| Daily or more | 1.4 (0.001) | 3.1 | 3 | 1.5 (<0.001) | 4.0 | 4 | – | – | – | – | – | |
| Receptive sharing needle/syringe | ||||||||||||
| No | – | 1 | 1 | – | – | – | ||||||
| Yes | – | 1.4 (0.005) | 3.4 | 3 | 1.4 (0.002) | 3.3 | 3 | |||||
| Receptive sharing ancillary equipment† | ||||||||||||
| No | 1 | 1 | 0 | 1 | 1 | |||||||
| Yes | 1.3 (0.006) | 2.5 | 3 | 1.3 (0.003) | 3.0 | 3 | – | – | – | 1.5 (0.001) | 3.8 | 4 |