“…For example, results obtained from recent studies have provided compelling evidence regarding their genetic and environmental etiologies (e.g., Fisher & DeFries, 2002;Schumacher et al, 2007;Williams & O'Donovan, 2006), subtypes or dimensions (e.g., Bailey, Manis, Pedersen & Seidenberg, 2004;Griffiths & Snowling, 2002;Olson, Datta, Gayán & DeFries, 1999;Vukovic & Siegel, 2006), gender differences (e.g., Harlaar, Spinath, Dale & Plomin, 2005;Rutter et al, 2004;Wadsworth & DeFries, 2005), and comorbidity with other conditions such as attention-deficit/hyperactivity disorder (ADHD) (e.g., Gayán et al, 2005;McGee, Prior, Williams, Smart & Sanson, 2002;Stevenson et al, 2005;Willcutt et al, 2002Willcutt et al, , 2003 and antisocial behavior (e.g., Trzesniewski, Moffitt, Caspi, Taylor & Maughan, 2006;Willcutt & Pennington, 2000). In addition, recent longitudinal studies have addressed the stability of RD and rates of change for disabled vs nondisabled readers (e.g., Badian, 1999;Bast & Reitsma, 1998;Raskind et al, 1998;Raskind, Higgins, Goldberg & Herman, 1999;Shaywitz et al, 2003).…”