The External Validity of Age-versus IQ-Discrepancy Definitions of Reading Disability: Lessons from a Twin Study.

Pennington, Bruce F.; And Others

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Peer reviewed

ERIC Number: EJ455855

Record Type: CIJE

Publication Date: 1992

Pages: N/A

Abstractor: N/A

ISBN: N/A

ISSN: ISSN-0022-2194

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The External Validity of Age-versus IQ-Discrepancy Definitions of Reading Disability: Lessons from a Twin Study.

Pennington, Bruce F.; And Others

Journal of Learning Disabilities, v25 n9 p562-73 Nov 1992

This study of 640 twins with reading disability and 436 controls (mean age 12) examined external validity of the distinction between specific reading retardation and reading backwardness, in 3 domains: genetic etiology, sex ratio and clinical correlates, and neuropsychological profiles. There was no evidence of differential genetic etiology of the two phenotypes (discrepancies based on age or intelligence). (JDD)

Descriptors: Age Differences, Definitions, Educational Diagnosis, Elementary Secondary Education, Etiology, Evaluation Methods, Genetics, Handicap Identification, Heredity, Intelligence Differences, Neuropsychology, Reading Difficulties, Sex Differences, Twins, Validity

Publication Type: Journal Articles; Reports - Research

Education Level: N/A

Audience: Researchers

Language: English

Sponsor: N/A

Authoring Institution: N/A

Grant or Contract Numbers: N/A

Author Affiliations: N/A