IngentaConnect WAIS III UK: An extension of the UK comparability study

Authors: Wycherley, Robert¹; Lavender, Anthony¹; Holttum, Sue¹; Crawford, John R.²; Mockler, Darren³

Source: British Journal of Clinical Psychology, Volume 44, Number 2, June 2005 , pp. 279-288(10)

Publisher: British Psychological Society

Abstract:

Objectives. To correct and augment the sample on which a previous study, assessing the applicability of USA WAIS III norms to the UK population, was based. To repeat this study using the modified sample.

Design. The WAIS III UK was administered to a supplementary sample, which was used to enhance and correct the original sample, allowing a better match to UK population demographics.

Method. WAIS III UK scores were processed using USA norms.

Results. Distributions of UK IQ, Index, and subtest scores were consistent with USA norms. Means were significantly above USA values and did not show a flat profile. Correlational analysis suggested the presence of an age-related sampling bias, which was then statistically controlled for using analysis of covariance, with age as covariate, to give corrected means. These means, with the exception of two subtests (block design and picture arrangement), did not differ significantly from USA values.

Conclusion. With a minor proviso concerning the above subtests, it is probable that USA norms can be safely used with the UK population. Future UK samples need to ensure random sampling within demographic categories if sampling bias is to be avoided.

Document Type: Research article

DOI: 10.1348/014466505X29440

Affiliations: 1: Centre for Applied Social and Psychological Development, Canterbury Christ Church University College, UK 2: School of Psychology, University of Aberdeen, UK 3: King's Wood Centre, Colchester, UK

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