Medical marijuana laws and adolescent marijuana use in the United States: a systematic review and meta-analysis

Addiction
Aaron L SarvetDeborah S Hasin

Abstract

To conduct a systematic review and meta-analysis of studies in order to estimate the effect of US medical marijuana laws (MMLs) on past-month marijuana use prevalence among adolescents. A total of 2999 papers from 17 literature sources were screened systematically. Eleven studies, developed from four ongoing large national surveys, were meta-analyzed. Estimates of MML effects on any past-month marijuana use prevalence from included studies were obtained from comparisons of pre-post MML changes in MML states to changes in non-MML states over comparable time-periods. These estimates were standardized and entered into a meta-analysis model with fixed-effects for each study. Heterogeneity among the study estimates by national data survey was tested with an omnibus F-test. Estimates of effects on additional marijuana outcomes, of MML provisions (e.g. dispensaries) and among demographic subgroups were abstracted and summarized. Key methodological and modeling characteristics were also described. Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines were followed. None of the 11 studies found significant estimates of pre-post MML changes compared with contemporaneous changes in non-MML states for marij...Continue Reading

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Methods Mentioned

BETA
YRBS

Software Mentioned

PsychInfo
metafor
ProQuest
Google Scholar
SocINDEX
R

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