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Two age groups are presented: younger children (age 6–13; A) and all children (age 6–18; B). Theta/beta ratio (TBR) means and SDs are presented. The 9 studies are shown chronologically as published. Note how the differences between ADHD and controls narrowed over time, and how much scatter is seen in TBR measurements among studies of younger children. From Arns et al.12
