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Improving IQ measurement in intellectual disabilities using true deviation from population norms / Stephanie M. SANSONE in Journal of Neurodevelopmental Disorders, 6-1 (December 2014)
[article]
Titre : Improving IQ measurement in intellectual disabilities using true deviation from population norms Type de document : Texte imprimé et/ou numérique Auteurs : Stephanie M. SANSONE, Auteur ; A. SCHNEIDER, Auteur ; E. BICKEL, Auteur ; Elizabeth BERRY-KRAVIS, Auteur ; C. PRESCOTT, Auteur ; D. HESSL, Auteur Article en page(s) : p.16 Langues : Anglais (eng) Mots-clés : Autism spectrum disorder Cognitive assessment Fragile X syndrome Iq Intellectual disability Index. décimale : PER Périodiques Résumé : BACKGROUND: Intellectual disability (ID) is characterized by global cognitive deficits, yet the very IQ tests used to assess ID have limited range and precision in this population, especially for more impaired individuals. METHODS: We describe the development and validation of a method of raw z-score transformation (based on general population norms) that ameliorates floor effects and improves the precision of IQ measurement in ID using the Stanford Binet 5 (SB5) in fragile X syndrome (FXS; n = 106), the leading inherited cause of ID, and in individuals with idiopathic autism spectrum disorder (ASD; n = 205). We compared the distributional characteristics and Q-Q plots from the standardized scores with the deviation z-scores. Additionally, we examined the relationship between both scoring methods and multiple criterion measures. RESULTS: We found evidence that substantial and meaningful variation in cognitive ability on standardized IQ tests among individuals with ID is lost when converting raw scores to standardized scaled, index and IQ scores. Use of the deviation z- score method rectifies this problem, and accounts for significant additional variance in criterion validation measures, above and beyond the usual IQ scores. Additionally, individual and group-level cognitive strengths and weaknesses are recovered using deviation scores. CONCLUSION: Traditional methods for generating IQ scores in lower functioning individuals with ID are inaccurate and inadequate, leading to erroneously flat profiles. However assessment of cognitive abilities is substantially improved by measuring true deviation in performance from standardization sample norms. This work has important implications for standardized test development, clinical assessment, and research for which IQ is an important measure of interest in individuals with neurodevelopmental disorders and other forms of cognitive impairment. En ligne : http://dx.doi.org/10.1186/1866-1955-6-16 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=346
in Journal of Neurodevelopmental Disorders > 6-1 (December 2014) . - p.16[article] Improving IQ measurement in intellectual disabilities using true deviation from population norms [Texte imprimé et/ou numérique] / Stephanie M. SANSONE, Auteur ; A. SCHNEIDER, Auteur ; E. BICKEL, Auteur ; Elizabeth BERRY-KRAVIS, Auteur ; C. PRESCOTT, Auteur ; D. HESSL, Auteur . - p.16.
Langues : Anglais (eng)
in Journal of Neurodevelopmental Disorders > 6-1 (December 2014) . - p.16
Mots-clés : Autism spectrum disorder Cognitive assessment Fragile X syndrome Iq Intellectual disability Index. décimale : PER Périodiques Résumé : BACKGROUND: Intellectual disability (ID) is characterized by global cognitive deficits, yet the very IQ tests used to assess ID have limited range and precision in this population, especially for more impaired individuals. METHODS: We describe the development and validation of a method of raw z-score transformation (based on general population norms) that ameliorates floor effects and improves the precision of IQ measurement in ID using the Stanford Binet 5 (SB5) in fragile X syndrome (FXS; n = 106), the leading inherited cause of ID, and in individuals with idiopathic autism spectrum disorder (ASD; n = 205). We compared the distributional characteristics and Q-Q plots from the standardized scores with the deviation z-scores. Additionally, we examined the relationship between both scoring methods and multiple criterion measures. RESULTS: We found evidence that substantial and meaningful variation in cognitive ability on standardized IQ tests among individuals with ID is lost when converting raw scores to standardized scaled, index and IQ scores. Use of the deviation z- score method rectifies this problem, and accounts for significant additional variance in criterion validation measures, above and beyond the usual IQ scores. Additionally, individual and group-level cognitive strengths and weaknesses are recovered using deviation scores. CONCLUSION: Traditional methods for generating IQ scores in lower functioning individuals with ID are inaccurate and inadequate, leading to erroneously flat profiles. However assessment of cognitive abilities is substantially improved by measuring true deviation in performance from standardization sample norms. This work has important implications for standardized test development, clinical assessment, and research for which IQ is an important measure of interest in individuals with neurodevelopmental disorders and other forms of cognitive impairment. En ligne : http://dx.doi.org/10.1186/1866-1955-6-16 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=346 Utility of an abbreviated version of the stanford-binet intelligence scales (5(th) ed.) in estimating 'full scale' IQ for young children with autism spectrum disorder / C. TWOMEY in Autism Research, 11-3 (March 2018)
[article]
Titre : Utility of an abbreviated version of the stanford-binet intelligence scales (5(th) ed.) in estimating 'full scale' IQ for young children with autism spectrum disorder Type de document : Texte imprimé et/ou numérique Auteurs : C. TWOMEY, Auteur ; H. O'CONNELL, Auteur ; M. LILLIS, Auteur ; S. L. TARPEY, Auteur ; G. O'REILLY, Auteur Article en page(s) : p.503-508 Langues : Anglais (eng) Mots-clés : IQ tests abbreviated battery IQ autism spectrum disorder cognitive assessment stanford-binet Index. décimale : PER Périodiques Résumé : The fifth edition of the Stanford-Binet Intelligence scales allows 'full scale' IQ (FSIQ) to be estimated using an abridged version of the test-the abbreviated battery IQ (ABIQ). Set within a public early intervention team service, the current cross-sectional study investigated the utility of the ABIQ in estimating FSIQ for 40 children with autism spectrum disorder (ASD) aged 3-5 years. A strong ABIQ-FSIQ association was yielded (r = 0.89; r(2) = 0.808) and the ABIQ did not over-estimate mean FSIQ above a clinically-relevant threshold; however, clinically significant over-estimation occurred in 17.5% of individual cases. While the findings provide support for the utility of the ABIQ in estimating FSIQ for young children with ASD, caution relating to the over-estimation of FSIQ is warranted. Careful clinical judgment-ideally based on examination of previous cognitive assessment results (if available), thorough interactional observations, and close multi-disciplinary consultation-is necessary to determine the applicability of the ABIQ to individual cases. Autism Res 2018, 11: 503-508. (c) 2017 International Society for Autism Research, Wiley Periodicals, Inc. LAY SUMMARY: We investigated the utility of a shortened version of the Stanford-Binet Intelligence Scales in estimating IQ for 40 young children with autism spectrum disorder (ASD). The findings provide qualified support for the instrument: acceptably accurate IQ estimation was achieved for most cases; but not so for a sizeable minority (17.5%). Careful clinical judgment is necessary to determine the applicability of the ABIQ to individual cases. En ligne : http://dx.doi.org/10.1002/aur.1911 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=352
in Autism Research > 11-3 (March 2018) . - p.503-508[article] Utility of an abbreviated version of the stanford-binet intelligence scales (5(th) ed.) in estimating 'full scale' IQ for young children with autism spectrum disorder [Texte imprimé et/ou numérique] / C. TWOMEY, Auteur ; H. O'CONNELL, Auteur ; M. LILLIS, Auteur ; S. L. TARPEY, Auteur ; G. O'REILLY, Auteur . - p.503-508.
Langues : Anglais (eng)
in Autism Research > 11-3 (March 2018) . - p.503-508
Mots-clés : IQ tests abbreviated battery IQ autism spectrum disorder cognitive assessment stanford-binet Index. décimale : PER Périodiques Résumé : The fifth edition of the Stanford-Binet Intelligence scales allows 'full scale' IQ (FSIQ) to be estimated using an abridged version of the test-the abbreviated battery IQ (ABIQ). Set within a public early intervention team service, the current cross-sectional study investigated the utility of the ABIQ in estimating FSIQ for 40 children with autism spectrum disorder (ASD) aged 3-5 years. A strong ABIQ-FSIQ association was yielded (r = 0.89; r(2) = 0.808) and the ABIQ did not over-estimate mean FSIQ above a clinically-relevant threshold; however, clinically significant over-estimation occurred in 17.5% of individual cases. While the findings provide support for the utility of the ABIQ in estimating FSIQ for young children with ASD, caution relating to the over-estimation of FSIQ is warranted. Careful clinical judgment-ideally based on examination of previous cognitive assessment results (if available), thorough interactional observations, and close multi-disciplinary consultation-is necessary to determine the applicability of the ABIQ to individual cases. Autism Res 2018, 11: 503-508. (c) 2017 International Society for Autism Research, Wiley Periodicals, Inc. LAY SUMMARY: We investigated the utility of a shortened version of the Stanford-Binet Intelligence Scales in estimating IQ for 40 young children with autism spectrum disorder (ASD). The findings provide qualified support for the instrument: acceptably accurate IQ estimation was achieved for most cases; but not so for a sizeable minority (17.5%). Careful clinical judgment is necessary to determine the applicability of the ABIQ to individual cases. En ligne : http://dx.doi.org/10.1002/aur.1911 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=352