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Univariate analyses revealed moderate to high heritability for all measures of reading difficulty and ADHD. Subsequent bivariate analyses indicated that the relation between reading difficulties and inattention symptoms is primarily attributable to common genetic influences, whereas bivariate heritability estimates were not significant for hyperactivity\u2010impulsivity and any of the reading measures. Reading difficulties and ADHD symptoms were more highly heritable if the proband met criteria for both disorders versus RD or ADHD alone, suggesting that future molecular genetic analyses of comorbid RD\u2009+\u2009ADHD may facilitate the identification of susceptibility genes for RD, ADHD, and their comorbidity. \u00a9 2007 Wiley\u2010Liss, Inc.<\/jats:p>","DOI":"10.1002\/ajmg.b.30310","type":"journal-article","created":{"date-parts":[[2007,4,17]],"date-time":"2007-04-17T17:17:29Z","timestamp":1176830249000},"page":"709-714","source":"Crossref","is-referenced-by-count":150,"title":["Understanding comorbidity: A twin study of reading disability and attention\u2010deficit\/hyperactivity disorder"],"prefix":"10.1002","volume":"144B","author":[{"given":"Erik G.","family":"Willcutt","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Bruce 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