Cross-cultural Prevalence
Cross-cultural study of the prevalence of dyslexia is difficult as different scholars and different countries often use different criteria to distinguish the cases of dyslexia in the continuum between the able and delayed readers at schools. According to the existing literature, the prevalence of dyslexia can vary widely between cultures. For example, Christall reports differences between 1% and 33%. According to some researchers, despite the significant differences between the writing systems, Italian, German and English populations suffer similarly from dyslexia.
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