The Teen Marijuana Check-Up (TMCU3)

University of Washington

Status and phase: Completed; Phase 2

Conditions: Cannabis Dependence; Cannabis Abuse

Treatments: Behavioral: Motivational enhancement therapy; Behavioral: Marijuana education

Study type: Interventional

Funder types: Other; NIH

Identifiers

NCT00350285

01-8666-G-05

R01DA014296 (U.S. NIH Grant/Contract)

Details and patient eligibility

About

This behavioral research is an efficacy trial evaluating an intervention called "The Teen Marijuana Check-Up" with non-treatment seeking adolescent marijuana users.

Full 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.

Enrollment: 310 patients

Sex: All

Ages: 14 to 19 years old

Volunteers: Accepts Healthy Volunteers

Inclusion and exclusion criteria

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.

Trial design

Primary purpose: Treatment

Allocation: Randomized

Interventional model: Parallel Assignment

Masking: None (Open label)

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310 participants in 3 patient groups

1

Experimental group

Description:

Motivational enhancement therapy

Treatment:

Behavioral: Motivational enhancement therapy

2

Active Comparator group

Description:

Marijuana education

Treatment:

Behavioral: Marijuana education

3

No Intervention group

Description:

Delayed treatment control condition