moderator hypothesis; can be misleading depending on how variables are coded; and therefore should not be interpreted (Baron & Kenny, 1986). Model-based plotting of the simple slopes showing the relationship between change in working memory and change in ADHD symptomatology as a function of genotype was conducted using IRSE [Interactions in Multiple Linear Regression with SPSS and Excel; http://www.urenz.ch/irse; (Meier, 2008)].
