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Percentage of children with dyslexia in second, fourth, and eighth grades (based on IQ discrepancy and low achievement criteria) who had specific language impairment in kindergarten.
| Discrepancy | 2nd Grade | 4th Grade | 8th Grade |
|---|---|---|---|
| Full Scale IQ | 15.4 | 14.8 | 16.5 |
| Nonverbal IQ | 19.4 | 19.1 | 19.3 |
An estimate of Full Scale IQ was used that included the Peabody Picture Vocabulary Test—Revised as a measure of verbal IQ.
