Adolescents earlier diagnosed as dyslexic show major IQ declines on the WISC-III |
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| Authors: | P T Ackerman N L Weir C A Holloway R A Dykman |
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| Institution: | (1) Center for Applied Research and Evaluation, Arkansas Children's Hospital, 800 Marshall Street, 72202-3591 Little Rock, AR, USA |
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| Abstract: | Adolescents (n=43) previously diagnosed as dyslexic/reading disabled had markedly lower IQ scores on the newly standardized Wechsler Intelligence Scale for Children (WISC-III) than on the earlier administered WISC-R. The declines for Verbal, Performance, and Full Scale IQs were 10, 12, and 11 points, respectively, which were twice as great as in a subset of the standardization sample given both versions of the WISC. The adolescents did not show a significant decline in standard scores from the Wide Range Achievement Test (Level I to Level II). However, only two subjects had current reading and spelling standard scores above the 25th percentile. The impact of lower WISC-III IQs on guidelines for classification of students as learning disabled is discussed. |
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| Keywords: | Achievement scores Adolescents Diagnostic criteria Dyslexia IQs |
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