IDF-10 diagnostic criteria for specific disorder of arithmetical skills

  • A score on a standardized arithmetic test that is at least two standard errors of prediction below the level expected on the basis of the child’s chronological age and general intelligence
  • Scores on reading accuracy and comprehension and on spelling that are within the normal range (± two standard deviations from the mean)
  • No history of significant reading or spelling difficulties

From: Dyslexia Dysorthography Dyscalculia

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