Trends and Characteristics in Marijuana Use Among Public School Students - King County, Washington, 2004-2016.

MMWR Morb Mortal Wkly Rep · 2019 · PMC6776375 · PMID 31581164

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a decreasing trendno p-value reported

Among grade 6 students there was a decreasing trend in self-reported past 30–day marijuana use from 2004 to 2016, while the percentage of grade 8 students who had used marijuana during the past 30 days did not change during that period.

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