The external validity of age- versus IQ-discrepancy definitions of reading disability: lessons from a twin study.

@article{Pennington1992TheEV,
  title={The external validity of age- versus IQ-discrepancy definitions of reading disability: lessons from a twin study.},
  author={Bruce F. Pennington and Jeffrey W. Gilger and Richard K. Olson and John C Defries},
  journal={Journal of learning disabilities},
  year={1992},
  volume={25 9},
  pages={562-73}
}
Recent research has raised the question of whether age- and IQ-discrepancy forms of reading disability (RD) are distinguishable in terms of either their underlying linguistic deficit or their response to treatment, thus threatening the external validity of the traditional distinction between specific reading retardation and reading backwardness. The present study pursued the external validity of this distinction in three domains: (a) genetic etiology, (b) sex ratio and clinical correlates, and… CONTINUE READING
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