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The other sample involved parents and siblings of 33 children who had been identified with symptoms through mass screening of all children in Grades 3 to 6 at two local schools. Two different samples were taken to investigate the possibility of parental referral bias. Familial incidence may be inflated in a referred sample because some parents may be aware of their own symptoms and actively seek assistance. For the sample of children referred for screening, there was an 81% chance of either one or both parents showing similar symptoms and a 76% chance of siblings being similarly affected. For the sample of children identified through school screening, there was an 85% chance of either one or both parents showing similar symptoms and a 54% chance of siblings being similarly affected. The data confirm previous estimates of incidence and suggest that Scotopic Sensitivity\/Irlen Syndrome may be a genetically-based deficit in visual processing.<\/jats:p>","DOI":"10.2466\/pms.2000.91.3.707","type":"journal-article","created":{"date-parts":[[2011,8,31]],"date-time":"2011-08-31T13:37:01Z","timestamp":1314797821000},"page":"707-724","source":"Crossref","is-referenced-by-count":9,"title":["The Familial Incidence of Symptoms of Scotopic Sensitivity\/Irlen Syndrome: Comparison of Referred and Mass-Screened Groups"],"prefix":"10.1177","volume":"91","author":[{"given":"G. L.","family":"Robinson","sequence":"first","affiliation":[{"name":"Special Education Centre, University of Newcastle. Australia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"P. J.","family":"Foreman","sequence":"additional","affiliation":[{"name":"Special Education Centre, University of Newcastle. Australia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"K. B. 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