U.S. middle and high schools with the most students taking prescription stimulants to treat ADHD also had, overall, the highest percentage of students who misused prescription stimulants within the past year.

The University of Michigan-led study highlights a significant association between ADHD stimulant therapy in schools and prescription stimulant misuse, said Sean Esteban McCabe, U-M professor of nursing and principal investigator on the study.

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Listen to Dr. McCabe’s conversation with CNN