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„Until recently, the typical definition of dyslexia involved a discrepancy between an IQ score and a reading score. If the IQ score was found to be significantly higher than the reading score, then this discrepancy was used as an index of dyslexia. This definition has been discredited for a variety of reasons. […] a number of studies [] in different countries have found that there are no differences in children who have reading problems between those who have a discrepancy between IQ and reading scores and those who do not.“
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