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The first section reviews the interrelationships between ADD and LD. Here we focus on definitional issues, trace the historical antecedents of ADD and LD, examine the prevalence of ADD and LD, and review studies designed to differentiate cognitive from attentional mechanisms in children with ADD, LD, or both. In the next section, we review the evidence linking ADD with COD, a distinction blurred in earlier investigations by problems with referral bias. More recent studies suggest that the antecedents, clinical characteristics, and prognosis may differ in children with ADD alone compared to those with ADD in association with COD. (J Child Neurol 1991;6(Suppl):S13-S20).<\/jats:p>","DOI":"10.1177\/0883073891006001s03","type":"journal-article","created":{"date-parts":[[2017,2,20]],"date-time":"2017-02-20T10:39:24Z","timestamp":1487587164000},"page":"S13-S22","source":"Crossref","is-referenced-by-count":69,"title":["Comorbidity: A Critical Issue in Attention Deficit Disorder"],"prefix":"10.1177","volume":"6","author":[{"given":"Bennett A.","family":"Shaywitz","sequence":"first","affiliation":[{"name":"Department of Pediatrics, Yale University School of\rMedicine, New Haven, CT"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Sally E.","family":"Shaywitz","sequence":"additional","affiliation":[{"name":"Department of Pediatrics, Yale University School of\rMedicine, New Haven, CT"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"179","published-online":{"date-parts":[[1991,1,1]]},"reference":[{"key":"atypb1","unstructured":"Shaywitz SE, Shaywitz BA: Attention deficit disorder: Current perspectives, in Kavanagh JF, Truss TJ (eds): Learning Disabilities: Proceedings of the National Conference. 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