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Intelligence is in the eye of the beholder: investigating repeated IQ-measurements in forensic psychiatry

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Abstract
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.
Keywords
cognitive ability, stability, Groninger Intelligence Test, intelligence tests, IQ, psychometrics, WAIS, repeated measures, RAVEN, LONG-TERM IMPRISONMENT, LEARNING-DISABILITIES, INTELLECTUAL ABILITY, COGNITIVE-ABILITIES, TEST PERFORMANCE, STABILITY, GAINS, QUOTIENT, CHILDREN, PEOPLE

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Please use this url to cite or link to this publication:

Chicago
Habets, Petra, Inge Jeandarme, Katarzyna Uzieblo, Karel Oei, and Stefan Bogaerts. 2015. “Intelligence Is in the Eye of the Beholder: Investigating Repeated IQ-measurements in Forensic Psychiatry.” Journal of Applied Research in Intellectual Disabilities 28 (3): 182–192.
APA
Habets, P., Jeandarme, I., Uzieblo, K., Oei, K., & Bogaerts, S. (2015). Intelligence is in the eye of the beholder: investigating repeated IQ-measurements in forensic psychiatry. JOURNAL OF APPLIED RESEARCH IN INTELLECTUAL DISABILITIES, 28(3), 182–192.
Vancouver
1.
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. JOURNAL OF APPLIED RESEARCH IN INTELLECTUAL DISABILITIES. 2015;28(3):182–92.
MLA
Habets, Petra, Inge Jeandarme, Katarzyna Uzieblo, et al. “Intelligence Is in the Eye of the Beholder: Investigating Repeated IQ-measurements in Forensic Psychiatry.” JOURNAL OF APPLIED RESEARCH IN INTELLECTUAL DISABILITIES 28.3 (2015): 182–192. Print.
@article{5798015,
  abstract     = {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{\textquoteright}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.},
  author       = {Habets, Petra and Jeandarme, Inge and Uzieblo, Katarzyna and Oei, Karel and Bogaerts, Stefan },
  issn         = {1360-2322},
  journal      = {JOURNAL OF APPLIED RESEARCH IN INTELLECTUAL DISABILITIES},
  language     = {eng},
  number       = {3},
  pages        = {182--192},
  title        = {Intelligence is in the eye of the beholder: investigating repeated IQ-measurements in forensic psychiatry},
  url          = {http://dx.doi.org/10.1111/jar.12120},
  volume       = {28},
  year         = {2015},
}

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