Intelligence is in the Eye of the Beholder: Investigating Repeated IQ Measurements in Forensic Psychiatry.

Journal of applied research in intellectual disabilities : JARID

PubMedID: 25175692

Habets P, Jeandarme I, Uzieblo K, Oei K, Bogaerts S. Intelligence is in the Eye of the Beholder: Investigating Repeated IQ Measurements in Forensic Psychiatry. J Appl Res Intellect Disabil. 2014;.
BACKGROUND
A stable assessment of cognition is of paramount importance for forensic psychiatric patients (FPP). The purpose of this study was to compare repeated measures of IQ scores in FPPs with and without intellectual disability.

METHODS
Repeated measurements of IQ scores in FPPs (n = 176) were collected. Differences between tests were computed, and each IQ score was categorized. Additionally, t-tests and regression analyses were performed.

RESULTS
Differences of 10 points or more were found in 66% of the cases comparing WAIS-III with RAVEN scores. Fisher's exact test revealed differences between two WAIS-III scores and the WAIS categories. The WAIS-III did not predict other IQs (WAIS or RAVEN) in participants with intellectual disability.

DISCUSSION
This study showed that stability or interchangeability of scores is lacking, especially in individuals with intellectual disability. Caution in interpreting IQ scores is therefore recommended, and the use of the unitary concept of IQ should be discouraged.