“From 2009 through 2016, the adjusted prevalence of prenatal marijuana use based on self-report or toxicology increased from 4.2% (95% CI, 4.0%-4.5%) to 7.1% (95% CI, 6.7%-7.5%) and was higher based on toxicology than selfreport each year (Figure 1). Linear trend tests found use increased at an ...
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