Table 3:

Excessive substance use, abstinence and psychosocial consequences* among all participating patients (n = 594)

OutcomeIntervention group, no. (%)Control group, no. (%)OR (95% CI)Intracluster correlation coefficient
Excessive use of alcohol, cannabis or both
 At 3 mo105 (42.2)118 (43.7)0.9 (0.6–1.4)0.025
 At 6 mo121 (48.4)108 (48.4)1.0 (0.6–1.6)0.046
 At 12 mo107 (52.2)105 (48.4)1.1 (0.7–1.8)0.018
Excessive alcohol use
 At 3 mo91 (36.5)112 (41.5)0.8 (0.5–1.2)0.031
 At 6 mo102 (45.7)116 (46.4)0.9 (0.6–1.5)0.057
 At 12 mo99 (48.3)102 (47.0)1.0 (0.7–1.6)0.030
Excessive cannabis use
 At 3 mo31 (12.4)25 (9.3)1.3 (0.7–2.7)0.027
 At 6 mo34 (15.2)31 (12.4)1.2 (0.6–2.3)0.027
 At 12 mo33 (15.6)20 (9.1)1.9 (1.0–3.5)0.010
Abstinence from alcohol
 At 3 mo64 (25.7)68 (25.2)1.0 (0.7–1.6)0.003
 At 6 mo63 (28.2)59 (23.6)1.3 (0.8–2.1)0.020
 At 12 mo50 (23.7)46 (20.9)1.2 (0.6–2.1)0.026
Abstinence from cannabis
 At 3 mo203 (81.5)228 (84.4)0.8 (0.5–1,4)0.008
 At 6 mo179 (80.3)209 (83.6)0.8 (0.5–1.4)0.016
 At 12 mo163 (77.2)187 (85.0)0.6 (0.3–1.1)0.020
Psychosocial consequences related to alcohol use*
 At 3 mo75 (30.1)85 (31.5)0.9 (0.5–1.6)0.062
 At 6 mo73 (32.7)82 (32.8)1.0 (0.6–1.6)0.039
 At 12 mo67 (30.5)67 (31.8)1.1 (0.7–1.7)0.016
Psychosocial consequences related to cannabis use*
 At 3 mo27 (10.8)22 (8.1)1.4 (0.7–2.5)0.004
 At 6 mo25 (11.2)25 (10.0)1.1 (0.6–2.2)0.013
 At 12 mo27 (12.8)18 (8.2)1.7 (0.8–3.3)0.017
  • Note: CI = confidence interval, OR = odds ratio.

  • * At least 1 self-reported psychosocial consequence of alcohol or cannabis use from a list of 9 possibilities.

  • Because of loss to follow-up, sample sizes ranged from 211 to 249 in the intervention group and 220 to 270 in the control group.