Table 1

Factors associated with continuous abstinence at months 3, 6 and 12

		At month 3		At month 6		At month 12
	%	OR (95% CI)	P value	OR (95% CI)	P value	OR (95% CI)	P value
Age
18–24 years	27	1		1		1
25–29 years	26	0.56 (0.24 to 1.34)	0.195	0.64 (0.24 to 1.72)	0.378	1.31 (0.53 to 3.25)	0.563
30–34 years	23	0.65 (0.26 to 1.60)	0.344	0.84 (0.31 to 2.25)	0.723	0.41 (0.11 to 1.56)	0.192
35+ years	24	1.96 (1.06 to 3.63)	0.032	1.92 (0.95 to 3.89)	0.069	1.54 (0.71 to 3.33)	0.278
Aboriginality status
Aboriginal	15	1		1		1
Non-Aboriginal	85	1.42 (0.69 to 2.91)	0.344	2.26 (0.87 to 5.87)	0.095	1.68 (0.64 to 4.41)	0.292
First-time offender
No	64	1		1		1
Yes	36	1.56 (0.96 to 2.53)	0.071	1.62 (0.94 to 2.78)	0.081	2.52 (1.38 to 4.57)	0.003
Years since conviction*
<5 years	82	1		1		1
5+years	18	2.54 (1.50 to 4.30)	0.001	2.24 (1.25 to 4.00)	0.007	1.67 (1.44 to 4.96)	0.002
Sharing the cell with a smoker
No	67	1		1		1
Yes	33	0.80 (0.47 to 1.33)	0.383	0.64 (0.35 to 1.17)	0.146	0.75 (0.40 to 1.44)	0.389
Attempted to quit past month
No	87	1		1		1
Yes	13	2.07 (1.13 to 3.78)	0.018	1.47 (0.73 to 2.96)	0.278	2.02 (0.99 to 4.11)	0.054
Number of cigarettes smoke
20+ cigarettes	70	1		1		1
<20 cigarettes	30	1.66 (1.01 to 2.73)	0.045	1.21 (0.68 to 2.14)	0.517	1.52 (0.82 to 2.80)	0.184
Alcohol consumption†
Risky levels	49	1		1		1
Not risk levels	51	1.05 (0.65 to 1.69)	0.846	1.03 (0.61 to 1.77)	0.899	1.17 (0.65 to 2.12)	0.595
Regular drugs used†
None	25	3.75 (1.92 to 7.34)	<0.001	4.43 (1.98 to 9.90)	<0.001	4.43 (1.71 to 11.49)	0.002
1 drug	25	2.11 (1.04 to 4.27)	0.039	2.25 (0.95 to 5.33)	0.065	3.72 (1.41 to 9.83)	0.008
2 drugs	21	0.82 (0.34 to 1.97)	0.657	1.62 (0.63 to 4.18)	0.315	1.69 (0.55 to 5.20)	0.364
3+ drugs	29	1		1		1
Injecting drug use†
Yes	64	1		1		1
Never/not regular	44	1.97 (1.22 to 3.19)	0.006	2.15 (1.24 to 3.71)	0.006	2.06 (1.13 to 3.76)	0.019
Dependence score‡
High	83	1		1		1
Low	17	1.42 (0.78 to 2.58)	0.246	0.91 (0.44 to 1.89)	0.809	1.66 (0.82 to 3.36)	0.160
Kessler-10*
High	29	1		1		1
Low (good)	71	2.92 (1.49 to 5.74)	0.002	5.60 (2.48 to 12.62)	<0.001	5.40 (2.25 to 12.98)	<0.001
Mental score*
First quartile	25	1		1		1
Second quartile	27	5.04 (2.07 to 12.31)	<0.001	9.11 (2.64 to 31.42)	<0.001	3.33 (1.15 to 9.61)	0.026
Third quartile	23	3.59 (1.45 to 8.91)	0.006	11.19 (3.20 to 39.05)	<0.001	3.24 (1.14 to 9.73)	0.027
Fourth quartile (excellent)	25	6.50 (2.70 to 15.69)	<0.001	5.38 (1.49 to 19.43)	0.010	3.19 (1.10 to 9.31)	0.033
Physical score¶
First quartile (Poor)	25	1		1		1
Second quartile	26	0.60 (0.29 to 1.23)	0.160	3.37 (1.35 to 8.41)	0.009	1.52 (0.57 to 4.06)	0.401
Third quartile	25	0.93 (0.48 to 1.81)	0.834	2.82 (1.11 to 7.18)	0.029	2.14 (0.78 to 5.86)	0.138
Fourth quartile (excellent)	24	1.17 (0.61 to 2.25)	0.645	3.20 (1.27 to 8.03)	0.013	3.03 (1.19 to 7.70)	0.020

*SF-12 mental health: score <40, score 40–45, score 46–50 and score >50.
†12 months prior to the imprison.
‡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.
SF-12, Short-Form 12.