Table 1

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

At month 3At month 6At month 12
%OR (95% CI)P valueOR (95% CI)P valueOR (95% CI)P value
Age
 18–24 years27111
 25–29 years260.56 (0.24 to 1.34)0.1950.64 (0.24 to 1.72)0.3781.31 (0.53 to 3.25)0.563
 30–34 years230.65 (0.26 to 1.60)0.3440.84 (0.31 to 2.25)0.7230.41 (0.11 to 1.56)0.192
 35+ years241.96 (1.06 to 3.63)0.0321.92 (0.95 to 3.89)0.0691.54 (0.71 to 3.33)0.278
Aboriginality status
 Aboriginal15111
 Non-Aboriginal851.42 (0.69 to 2.91)0.3442.26 (0.87 to 5.87)0.0951.68 (0.64 to 4.41)0.292
First-time offender
 No64111
 Yes361.56 (0.96 to 2.53)0.0711.62 (0.94 to 2.78)0.0812.52 (1.38 to 4.57)0.003
Years since conviction*
 <5 years82111
 5+years182.54 (1.50 to 4.30)0.0012.24 (1.25 to 4.00)0.0071.67 (1.44 to 4.96)0.002
Sharing the cell with a smoker
 No67111
 Yes330.80 (0.47 to 1.33)0.3830.64 (0.35 to 1.17)0.1460.75 (0.40 to 1.44)0.389
Attempted to quit past month
 No87111
 Yes132.07 (1.13 to 3.78)0.0181.47 (0.73 to 2.96)0.2782.02 (0.99 to 4.11)0.054
Number of cigarettes smoke
 20+ cigarettes70111
 <20 cigarettes301.66 (1.01 to 2.73)0.0451.21 (0.68 to 2.14)0.5171.52 (0.82 to 2.80)0.184
Alcohol consumption†
 Risky levels49111
 Not risk levels511.05 (0.65 to 1.69)0.8461.03 (0.61 to 1.77)0.8991.17 (0.65 to 2.12)0.595
Regular drugs used†
 None253.75 (1.92 to 7.34)<0.0014.43 (1.98 to 9.90)<0.0014.43 (1.71 to 11.49)0.002
 1 drug252.11 (1.04 to 4.27)0.0392.25 (0.95 to 5.33)0.0653.72 (1.41 to 9.83)0.008
 2 drugs210.82 (0.34 to 1.97)0.6571.62 (0.63 to 4.18)0.3151.69 (0.55 to 5.20)0.364
 3+ drugs29111
Injecting drug use†
 Yes64111
 Never/not regular441.97 (1.22 to 3.19)0.0062.15 (1.24 to 3.71)0.0062.06 (1.13 to 3.76)0.019
Dependence score‡
 High83111
 Low171.42 (0.78 to 2.58)0.2460.91 (0.44 to 1.89)0.8091.66 (0.82 to 3.36)0.160
Kessler-10*
 High29111
 Low (good)712.92 (1.49 to 5.74)0.0025.60 (2.48 to 12.62)<0.0015.40 (2.25 to 12.98)<0.001
Mental score*
 First quartile25111
 Second quartile275.04 (2.07 to 12.31)<0.0019.11 (2.64 to 31.42)<0.0013.33 (1.15 to 9.61)0.026
 Third quartile233.59 (1.45 to 8.91)0.00611.19 (3.20 to 39.05)<0.0013.24 (1.14 to 9.73)0.027
Fourth quartile (excellent)256.50 (2.70 to 15.69)<0.0015.38 (1.49 to 19.43)0.0103.19 (1.10 to 9.31)0.033
Physical score¶
 First quartile (Poor)25111
 Second quartile260.60 (0.29 to 1.23)0.1603.37 (1.35 to 8.41)0.0091.52 (0.57 to 4.06)0.401
 Third quartile250.93 (0.48 to 1.81)0.8342.82 (1.11 to 7.18)0.0292.14 (0.78 to 5.86)0.138
 Fourth quartile (excellent)241.17 (0.61 to 2.25)0.6453.20 (1.27 to 8.03)0.0133.03 (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.