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Randomized Controlled Trial
. 2006 Oct;74(5):955-66.
doi: 10.1037/0022-006X.74.5.955.

The use of contingency management and motivational/skills-building therapy to treat young adults with marijuana dependence

Kathleen M Carroll  1 , Caroline J Easton, Charla Nich, Karen A Hunkele, Tara M Neavins, Rajita Sinha, Haley L Ford, Sally A Vitolo, Cheryl A Doebrick, Bruce J Rounsaville
Affiliations
Randomized Controlled Trial

The use of contingency management and motivational/skills-building therapy to treat young adults with marijuana dependence

Kathleen M Carroll et al. J Consult Clin Psychol. 2006 Oct.

Abstract

Marijuana-dependent young adults (N = 136), all referred by the criminal justice system, were randomized to 1 of 4 treatment conditions: a motivational/skills-building intervention (motivational enhancement therapy/cognitive-behavioral therapy; MET/CBT) plus incentives contingent on session attendance or submission of marijuana-free urine specimens (contingency management; CM), MET/CBT without CM, individual drug counseling (DC) plus CM, and DC without CM. There was a significant main effect of CM on treatment retention and marijuana-free urine specimens. Moreover, the combination of MET/CBT plus CM was significantly more effective than MET/CBT without CM or DC plus CM, which were in turn more effective than DC without CM for treatment attendance and percentage of marijuana-free urine specimens. Participants assigned to MET/CBT continued to reduce the frequency of their marijuana use through a 6-month follow-up.

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Figures

Figure 1
Figure 1
Participant flow and data availability through the trial. Motivational enhancement therapy/cognitive–behavioral therapy (MET/CBT) = motivational/skills-building intervention; DC = individual drug counseling; CM = contingency management.
Figure 2
Figure 2
Likelihood of submitting a marijuana-positive urine specimen, by week and treatment condition (estimates based on random regression analyses). MJ = marijuana; motivational enhancement therapy/cognitive–behavioral therapy (MET/CBT) = motivational/skills-building intervention; DC = individual drug counseling; CM = contingency management.
Figure 3
Figure 3
Marijuana use during 6-month follow-up, by treatment condition and month (estimates based on random regression analyses). Motivational enhancement therapy/cognitive–behavioral therapy (MET/CBT) = motivational/skills-building intervention; DC = individual drug counseling; CM = contingency management.
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