Table 2

Multivariate models only factors p<0.10 were considered for the multivariate analysis: continuous abstinence at months 3, 6 and 12; adjusted OR and 95% CI

Multivariate analysisMultivariate analysisMultivariate analysis
At month 3At month 6At month 12
aOR (95% CI)P valueaOR (95% CI)P valueaOR (95% CI)P value
Years since conviction
 <5 years111
 5+ years3.20 (1.71 to 6.00)<0.0012.60 (1.33 to 5.04)0.0052.40 (1.23 to 4.67)0.01
Kessler-10*
 High (score 16+)111
 Low (score <16)2.08 (1.17 to 3.68)0.0123.31 (1.37 to 7.97)0.0082.83 (1.19 to 6.72)0.019
Mental health score†
 First quartile111
 Second quartile8.67 (3.31 to 22.68)<0.0015.88 (1.81 to 19.11)0.0033.10 (1.11 to 8.63)0.030
 Third quartile8.51 (3.10 to 23.41)<0.0015.77 (1.81 to 18.42)0.0034.11 (1.49 to 11.38)0.006
Fourth quartile10.23 (4.10 to 25.72)<0.0016.39 (2.00 to 20.54)0.0024.25 (1.53 to 11.80)0.006
Physical health score‡
 First quartile111
 Second quartile0.64 (0.27,1.53)0.3143.02 (1.14 to 8.00)0.0261.53 (0.58 to 3.97)0.391
 Third quartile1.10 (0.50 to 2.35)0.8422.57 (0.95 to 6.96)0.0632.21 (0.80 to 6.11)0.127
 Fourth quartile2.43 (1.07 to 5.06)0.0333.64 (1.35 to 9.83)0.0114.47 (1.78 to 11.25)0.001
Total drugs used §
 None3.83 (1.84,8.00)<0.0014.44 (1.86 to 10.63)0.0014.91 (1.80 to 13.38)0.002
 1 drug2.20 (1.03 to 4.72)0.0432.02 (0.81 to 5.03)0.1304.42 (1.58 to 12.37)0.005
 2 drugs0.71 (0.28 to 1.80)0.4651.83 (0.67,5.01)0.2391.80 (0.56 to 5.78)0.326
 3+ drugs111
  • *time dependent; results further adjusted for age and aboriginality status

  • †SF-12 mental health: score <40, score 40–45, score 46–50 and score >50.

  • ‡SF-12 physical health: score <50, score 50–55, score 56–60 and score >60.

  • §12 months prior to imprisonment.

  • SF-12, Short-Form 12.