The stability of IQ in people with low intellectual ability: an analysis of the literature

Whitaker, Simon (2008) The stability of IQ in people with low intellectual ability: an analysis of the literature. Intellectual and Developmental Disabilities, 46 (2). pp. 120-128. ISSN 19349556

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Abstract

A meta-analysis of the stability of low IQ (IQ 80) was performed on IQ tests that have been
commonly used—tests that were derived by D. Wechsler (1949, 1955, 1974, 1981, 1991, 1997)
and those based on the Binet scales (L. M. Terman, 1960; L. M. Terman & Merrill, 1972). Weighted-
mean stability coefficients of .77 and .78 were found for Verbal IQ (V IQ) and Performance IQ
(P IQ) on the Wechsler tests and .82 for Full-Scale IQ (FS IQ) on both Wechsler and Binet tests,
for a mean test–retest interval of 2.8 years. Although the majority of FS IQs changed by less than
6 points, 14% changed by 10 points or more. The author suggests that the results of IQ assessment
should be treated with more caution than previously thought.

Item Type:	Article
Subjects:	B Philosophy. Psychology. Religion > BF Psychology
Schools:	School of Human and Health Sciences School of Human and Health Sciences > Centre for Applied Psychological Research School of Human and Health Sciences > Centre for Health and Social Care Research
Related URLs:	Author
Depositing User:	Simon Whitaker
Date Deposited:	01 Jul 2009 13:48
Last Modified:	01 Dec 2016 09:31
URI:	http://eprints.hud.ac.uk/id/eprint/4283

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