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Study Title and Description

Motivational enhancement therapy for adolescent marijuana users: a preliminary randomized controlled trial.



Key Questions Addressed
1 Evidence map
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Primary Publication Information
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TitleData
Title Motivational enhancement therapy for adolescent marijuana users: a preliminary randomized controlled trial.
Author Walker DD., Roffman RA., Stephens RS., Wakana K., Berghuis J., Kim W.
Country School of Social Work and Innovative Programs Research Group, University of Washington, Seattle, WA 98105, USA. ddwalker@u.washington.edu
Year 2006
Numbers Pubmed ID: 16822119

Secondary Publication Information
There are currently no secondary publications defined for this study.


Extraction Form: Evidence Map
Arms
Number Title Description Comments
1 MI Motivational enhancement therapy
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2 TAU 3-month delay condition
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Design Details
Question... Follow Up Answer Follow-up Answer
Should this citation be included? Yes
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Does this paper originate from a primary study of interest? No
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Ages eligible (in years) 14
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19
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Total sample size (in all arms) 97
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Age distribution of enrolled population (in years) 15.74
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Substance used Cannabis
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Interventions studied? Behavioral
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Outcome? Objective measurement of use/abstinence and/or intensity
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Self report of use/abstinence and/or intensity
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Age variation of enrolled population (in years) 1.24
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Study type RCT
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Is any arm a brief intervention (or single session)? No
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Income level of country(ies) of origin ... Country(ies) name(s) Unclear ... United States
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Results & Comparisons


Results Data
Outcome: cannabis use days      Population: All Participants
Time Point Measure MI TAU


0 months

N Analyzed 47 50
Mean 39.7 36.82
SD 17.02 16.94


3 months

N Analyzed 47 50
Mean 31.05 32.76
SD 23.28 20.61


Quality Dimensions
Dimension Value Notes Comments
Intention-to-treat-analysis: Bias due to incomplete reporting and analysis according to group allocation No Said used ITT, but reported data for completers only (Table 2)
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Group similarity at baseline (selection bias): Selection bias due to dissimilarity at baseline for the most important prognostic indicators Unsure Statistical analyses not reported
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Co-interventions (performance bias): Performance bias because co-interventions were different across groups Yes None
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Compliance (performance bias): Performance bias due to inappropriate compliance with interventions across groups No Data
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Timing of outcome assessments (detection bias): Detection bias because important outcomes were not measured at the same time across groups Yes Same
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Additional Bias: Bias due to problems not covered elsewhere in the table. If yes, describe them in the Notes. No
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Random sequence generation (selection bias): Selection bias (biased allocation to interventions) due to inadequate generation of a randomized sequence Unclear
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Allocation concealment (selection bias): Selection bias (biased allocation to interventions) due to inadequate concealment of allocations prior to assignment Unclear
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Blinding of participants (performance bias): Performance bias due to knowledge of the allocated interventions by participants during the study High
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Blinding of personnel/ care providers (performance bias): Performance bias due to knowledge of the allocated interventions by personnel/care providers during the study. High
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Blinding of outcome assessor (detection bias): Detection bias due to knowledge of the allocated interventions by outcome assessors. Unclear Not reported
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Incomplete outcome data (attrition bias): Attrition bias due to amount, nature or handling of incomplete outcome data Low 5%
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Selective Reporting (reporting bias): Reporting bias due to selective outcome reporting
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Quality Rating
No quality rating data was found.