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 analysis		Multivariate analysis		Multivariate analysis
	At month 3		At month 6		At month 12
	aOR (95% CI)	P value	aOR (95% CI)	P value	aOR (95% CI)	P value
Years since conviction
<5 years	1		1		1
5+ years	3.20 (1.71 to 6.00)	<0.001	2.60 (1.33 to 5.04)	0.005	2.40 (1.23 to 4.67)	0.01
Kessler-10*
High (score 16+)	1		1		1
Low (score <16)	2.08 (1.17 to 3.68)	0.012	3.31 (1.37 to 7.97)	0.008	2.83 (1.19 to 6.72)	0.019
Mental health score†
First quartile	1		1		1
Second quartile	8.67 (3.31 to 22.68)	<0.001	5.88 (1.81 to 19.11)	0.003	3.10 (1.11 to 8.63)	0.030
Third quartile	8.51 (3.10 to 23.41)	<0.001	5.77 (1.81 to 18.42)	0.003	4.11 (1.49 to 11.38)	0.006
Fourth quartile	10.23 (4.10 to 25.72)	<0.001	6.39 (2.00 to 20.54)	0.002	4.25 (1.53 to 11.80)	0.006
Physical health score‡
First quartile	1		1		1
Second quartile	0.64 (0.27,1.53)	0.314	3.02 (1.14 to 8.00)	0.026	1.53 (0.58 to 3.97)	0.391
Third quartile	1.10 (0.50 to 2.35)	0.842	2.57 (0.95 to 6.96)	0.063	2.21 (0.80 to 6.11)	0.127
Fourth quartile	2.43 (1.07 to 5.06)	0.033	3.64 (1.35 to 9.83)	0.011	4.47 (1.78 to 11.25)	0.001
Total drugs used §
None	3.83 (1.84,8.00)	<0.001	4.44 (1.86 to 10.63)	0.001	4.91 (1.80 to 13.38)	0.002
1 drug	2.20 (1.03 to 4.72)	0.043	2.02 (0.81 to 5.03)	0.130	4.42 (1.58 to 12.37)	0.005
2 drugs	0.71 (0.28 to 1.80)	0.465	1.83 (0.67,5.01)	0.239	1.80 (0.56 to 5.78)	0.326
3+ drugs	1		1		1

*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.