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The Teen Marijuana Check-Up (TMCU3)

This study has been completed.
National Institute on Drug Abuse (NIDA)
Information provided by:
University of Washington Identifier:
First received: July 5, 2006
Last updated: October 21, 2008
Last verified: October 2008
This behavioral research is an efficacy trial evaluating an intervention called "The Teen Marijuana Check-Up" with non-treatment seeking adolescent marijuana users.

Condition Intervention Phase
Cannabis Abuse
Cannabis Dependence
Behavioral: Motivational enhancement therapy
Behavioral: Marijuana education
Phase 2

Study Type: Interventional
Study Design: Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Open Label
Primary Purpose: Treatment
Official Title: Reaching and Motivating Change in Teen Marijuana Smokers

Resource links provided by NLM:

Further study details as provided by University of Washington:

Primary Outcome Measures:
  • Self-report of marijuana use [ Time Frame: 3 months and 12 months ]

Secondary Outcome Measures:
  • Accepting abstinence-focused counseling [ Time Frame: 3 months and 12 months ]

Enrollment: 310
Study Start Date: September 2004
Study Completion Date: June 2008
Primary Completion Date: June 2008 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Experimental: 1
Motivational enhancement therapy
Behavioral: Motivational enhancement therapy
Personal feedback with counselor using motivational interviewing strategies.
Active Comparator: 2
Marijuana education
Behavioral: Marijuana education
Information about health and behavioral effects of marijuana use.
No Intervention: 3
Delayed treatment control condition

Detailed Description:

Three hundred adolescents who smoke marijuana (ages 14-19), recruited in four Seattle-area high schools, will be enrolled in the trial. Participants will be recruited either through in-class presentations focusing on marijuana or via referrals from school staff. They will first be assessed regarding use of marijuana, alcohol, and other drugs, as well as pertinent attitudes and goals. Participants will then be randomly assigned to one of three conditions.

  • The experimental intervention is a two-session motivational enhancement treatment. A personalized feedback report, containing information from the participant's assessment as well as normative comparison data, is reviewed, with the Health Educator employing motivational interviewing strategies intended to enhance motivation for reduction or cessation of marijuana use. Specific goals for change and behavior change strategies are discussed with participants who wish support to change their marijuana use.
  • The comparison condition involves two educational sessions focusing on the health and behavioral effects of marijuana.
  • The third condition (delayed treatment control) involves a minimal baseline assessment followed three months later by a reassessment interview. Those assigned to this condition will then be given their choice of either active treatment.

Following completion of their two intervention sessions, participants in the two active treatments will be offered an additional four sessions of cognitive-behavioral skills training in which the focus is strategies in quitting marijuana. All participants will be reassessed at 3 and 12 months following their initial assessment interviews.


Ages Eligible for Study:   14 Years to 19 Years   (Child, Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes

Inclusion Criteria: Individuals who contact the project will be screened according to the following inclusion criteria:

  • age (14-19 years old),
  • grade level (freshmen through seniors) and
  • marijuana use (smoked 9 or more days in past 30).

Exclusion Criteria: Individuals will be excluded if:

  • they are not fluent in English,
  • they have a thought disorder that precludes full participation,
  • they refuse to accept randomization to condition.

In addition to the inclusion and exclusion criteria, participants who appear to be in psychological or physical distress will be assessed further and referred to other services as appropriate. The need for other services will not necessarily preempt participation in the TMCU unless the individual is incapable or unwilling to complete the protocol. As was the case in our Stage 1b trial, all ineligible applicants will be offered a single feedback session, and the Strategies That Work booklet will be offered to those who indicate any interest in reducing or quitting marijuana use.

  Contacts and Locations
Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the Contacts provided below. For general information, see Learn About Clinical Studies.

Please refer to this study by its identifier: NCT00350285

Sponsors and Collaborators
University of Washington
National Institute on Drug Abuse (NIDA)
Principal Investigator: Roger A Roffman, DSW University of Washington School of Social Work
  More Information

Responsible Party: Roger A. Roffman /Professor, University of Washington Identifier: NCT00350285     History of Changes
Other Study ID Numbers: 01-8666-G-05
R01DA014296 ( US NIH Grant/Contract Award Number )
Study First Received: July 5, 2006
Last Updated: October 21, 2008

Keywords provided by University of Washington:

Additional relevant MeSH terms:
Marijuana Abuse
Substance-Related Disorders
Chemically-Induced Disorders
Mental Disorders processed this record on March 27, 2017