“…It has been estimated that approximately 59-87% of children and adolescents with ADHD may have at least one comorbid disorder McGough et al, 2005), and as many as 20% may have three or more comorbid disorders (Rowland et al, 2002). Many of the comorbid conditions present with several core symptoms of ADHD, including bipolar disorder (Biederman, Faraone, Mick, Wozniak et al, 1996;Biederman, Monuteaux, Kendrick, Klein, & Faraone, 2005;Jaideep, Reddy, & Srinath, 2006;Wozniak et al, 2004), anxiety disorder (March et al, 2000;Newcorn et al, 2001), mood disorder (Schmidt, Stark, Carlson, & Anthony, 1998;Wozniak et al, 2004), and childhood abuse/neglect (Glod & Teicher, 1996). Psychiatric comorbidities that involve externalizing disorder with an aggressive component, such as ODD (35.2%, 95% CI 27.2, 43.8) or CD (25.7%, 95% CI: 12.8, 41.3) tend to occur more frequently than those that involve internalizing disorders, such as anxiety (25.8%, 95% CI: 17.6, 35.3) or depressive/mood disorder (18.2%, 95% CI: 11.1, 26.6) (Barkley, Anastopoulos, Guevremont, & Fletcher, 1991;Bird, Gould, & Staghezza, 1993;MTA, 1999a;Shekim et al, 1985).…”