Dyslexia Facts

National Institute of Health results on Dyslexia, Released in 1994

  • Dyslexia represents the most common and prevalent of all known learning disabilities.
  • Dyslexia is the leading cause of reading failure and school dropouts in our nation.
  • Reading failure is the most commonly shared characteristic of juvenile justice offenders. • Early intervention is essential for this population.
  • Dyslexia is identifiable, with 92% accuracy, at ages 5 1/2 to 6 1/2.
  • Dyslexia occurs in 15 – 20% of the population
  • Dyslexia is genetic – with an estimated 50% rate of heritability in families
  • Dyslexia is a neurobiological difference in the brain structure – children walk into kindergarten with dyslexia
  • Dyslexia often co-exists with other conditions such as ADHD, dysgraphia, dyscalculia, dyspraxia, anxiety, and depression
  • Indicators include poor reading skills (decoding and fluency), writing, and spelling
  • Underlying deficits include:
    • Phonemic Awareness – Ability to hear and manipulate individual phonemes.
    • Phonological Memory – Ability to hold onto speech based information in short term memory
    • Rapid Automatized Naming (RAN) – Ability to retrieve words & symbols/letters quickly from long term memory