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. Author manuscript; available in PMC: 2010 Apr 12.
Published in final edited form as: J Speech Lang Hear Res. 2005 Dec;48(6):1378–1396. doi: 10.1044/1092-4388(2005/096)

Table 1.

Percentages of children with specific language impairment in kindergarten (N = 106) who met various criteria for dyslexia.

Criteria 2nd grade 4th grade 8th grade
Low achievement 33.0 31.1 35.8
Low achievement
   + IQ cutoff
   Full Scale IQ 18.9 19.8 20.8
   Nonverbal IQ 26.4 25.5 26.4
IQ discrepancy
   Full Scale IQ 17.9 17.0 18.8
   Nonverbal IQ 25.5 27.4 29.2
IQ discrepancy
   + low achievement
   Full Scale IQ 17.9 17.0 17.9
   Nonverbal IQ 24.5 24.5 28.3

An estimate of Full Scale IQ was used that included the Peabody Picture Vocabulary Test—Revised as a measure of Verbal IQ.