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Adolescent substance users (n=47) with lower baseline fractional anisotropy (FA) in the fornix (A, C) and superior corona radiata (B) averaged bilaterally showed significantly increased risk-taking behaviors at 18-month follow-up. T-scores (y-axes) reflect number of days of substance use in the past month at 18-month follow-up (A,B) and an index of other risk taking behaviors at 18-month follow-up.
