8 recherche sur le mot-clé 'Differential item functioning'

Differential Item Functioning Based on Autism Features, IQ, and Age on the Screen for Child Anxiety Related Disorders (SCARED) Among Youth on the Autism Spectrum / H. K. SCHILTZ in Autism Research, 14-6 (June 2021)  

Public ISBD [article]  inAutism Research > 14-6 (June 2021) . - p.1220-1236 Titre : Differential Item Functioning Based on Autism Features, IQ, and Age on the Screen for Child Anxiety Related Disorders (SCARED) Among Youth on the Autism Spectrum Type de document : Texte imprimé et/ou numérique Auteurs : H. K. SCHILTZ, Auteur ; B. E. MAGNUS, Auteur Article en page(s) : p.1220-1236 Langues : Anglais (eng) Mots-clés : Adolescent  Anxiety  Anxiety Disorders/diagnosis  Autism Spectrum Disorder/complications  Autistic Disorder  Child  Humans  Psychometrics  Reproducibility of Results  anxiety  autism  differential item functioning  measurement  psychometrics Index. décimale : PER Périodiques Résumé : Anxiety commonly occurs among youth on the autism spectrum, yet measurement of anxiety in this population is complicated by a number of factors, including potentially overlapping symptomatology, the child's intellectual functioning, and changes in anxiety across development. Moreover, few studies have examined the psychometric properties of anxiety measures in this population, and no study to date has tested whether there are systematic differences in the measurement of anxiety, or differential item functioning (DIF), across the high degree of heterogeneity and the developmental course of autism. To test this possibility, data were combined across multiple studies using the National Database for Autism Research, an NIH-funded data repository. Parent-report on the Screen for Child Anxiety Related Disorders (SCARED) and Social Communication Questionnaire (SCQ) were used as measures of anxiety and autism features, respectively. A confirmatory factor analysis indicated good fit of the literature standard five-factor structure. Moderated nonlinear factor analysis (MNLFA) revealed multiple items with intercept and loading DIF based on level of autism features, IQ, and age, especially for items related to social behavior. Therefore, although the measure's factor structure is consistent with that found in the general population, the SCARED may not capture differences in anxiety equivalently for all children on the spectrum and across their development. Clinicians and researchers need to be especially vigilant in measuring anxiety symptoms in children with autism by removing items flagged for DIF from the SCARED and/or by using multiple measures and informants. LAY ABSTRACT: Autistic youth often experience clinical levels of anxiety. Many tools used to measure anxiety were developed for the general population, but not for use with autistic youth. This study found that the Screen for Child Anxiety Related Disorders (SCARED) measures the same five dimensions of anxiety as in the general population. Parents, however, may respond differently to questions on the SCARED based on their child's autism features, intellectual functioning, and age, which impacts our ability to accurately measure anxiety among autistic youth. En ligne : http://dx.doi.org/10.1002/aur.2481 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=449 [article] Differential Item Functioning Based on Autism Features, IQ, and Age on the Screen for Child Anxiety Related Disorders (SCARED) Among Youth on the Autism Spectrum [Texte imprimé et/ou numérique] / H. K. SCHILTZ, Auteur ; B. E. MAGNUS, Auteur . - p.1220-1236. Langues : Anglais (eng) in Autism Research > 14-6 (June 2021) . - p.1220-1236 Mots-clés : Adolescent  Anxiety  Anxiety Disorders/diagnosis  Autism Spectrum Disorder/complications  Autistic Disorder  Child  Humans  Psychometrics  Reproducibility of Results  anxiety  autism  differential item functioning  measurement  psychometrics Index. décimale : PER Périodiques Résumé : Anxiety commonly occurs among youth on the autism spectrum, yet measurement of anxiety in this population is complicated by a number of factors, including potentially overlapping symptomatology, the child's intellectual functioning, and changes in anxiety across development. Moreover, few studies have examined the psychometric properties of anxiety measures in this population, and no study to date has tested whether there are systematic differences in the measurement of anxiety, or differential item functioning (DIF), across the high degree of heterogeneity and the developmental course of autism. To test this possibility, data were combined across multiple studies using the National Database for Autism Research, an NIH-funded data repository. Parent-report on the Screen for Child Anxiety Related Disorders (SCARED) and Social Communication Questionnaire (SCQ) were used as measures of anxiety and autism features, respectively. A confirmatory factor analysis indicated good fit of the literature standard five-factor structure. Moderated nonlinear factor analysis (MNLFA) revealed multiple items with intercept and loading DIF based on level of autism features, IQ, and age, especially for items related to social behavior. Therefore, although the measure's factor structure is consistent with that found in the general population, the SCARED may not capture differences in anxiety equivalently for all children on the spectrum and across their development. Clinicians and researchers need to be especially vigilant in measuring anxiety symptoms in children with autism by removing items flagged for DIF from the SCARED and/or by using multiple measures and informants. LAY ABSTRACT: Autistic youth often experience clinical levels of anxiety. Many tools used to measure anxiety were developed for the general population, but not for use with autistic youth. This study found that the Screen for Child Anxiety Related Disorders (SCARED) measures the same five dimensions of anxiety as in the general population. Parents, however, may respond differently to questions on the SCARED based on their child's autism features, intellectual functioning, and age, which impacts our ability to accurately measure anxiety among autistic youth. En ligne : http://dx.doi.org/10.1002/aur.2481 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=449

Assessing general and autism-relevant quality of life in autistic adults: A psychometric investigation using item response theory / Z. J. WILLIAMS in Autism Research, 14-8 (August 2021)  

Public ISBD [article]  inAutism Research > 14-8 (August 2021) . - p.1633-1644 Titre : Assessing general and autism-relevant quality of life in autistic adults: A psychometric investigation using item response theory Type de document : Texte imprimé et/ou numérique Auteurs : Z. J. WILLIAMS, Auteur ; K. O. GOTHAM, Auteur Article en page(s) : p.1633-1644 Langues : Anglais (eng) Mots-clés : Adult  Autism Spectrum Disorder  Autistic Disorder  Female  Humans  Male  Psychometrics  Quality of Life  Sexism  Surveys and Questionnaires  ASQoL  autism  differential item functioning  item response theory  measurement invariance  quality of life  reliability  sex differences  validity  well-being  Roche. He also serves on the family advisory committee of the Autism Speaks Autism  Treatment Network Vanderbilt site and the autistic researcher review board of the  Autism Intervention Research Network on Physical Health (AIR-P). Katherine Gotham  has no conflicts of interest to disclose. Index. décimale : PER Périodiques Résumé : Although many interventions and services for autistic people have the ultimate goal of improving quality of life (QoL), there is relatively little research on how best to assess this construct in the autistic population, and existing scales designed for non-autistic individuals may not assess all meaningful facets of QoL in the autistic population. To address this need, the autism spectrum QoL form (ASQoL) was recently developed as a measure of the autism-relevant quality of life. However, the psychometrics of the ASQoL have not been examined beyond the authors' initial validation study, and important properties such as measurement invariance/differential item functioning (DIF) have not yet been tested. Using data from 700 autistic adults recruited from the Simons Foundation's SPARK cohort, the current study sought to perform a comprehensive independent psychometric evaluation of the ASQoL using item response theory, comparing its performance to a newly-proposed brief measure of general QoL (the WHOQOL-4). Our models revealed substantial DIF by sex and gender in the ASQoL, which caused ASQoL scores to grossly underestimate the self-reported QoL of autistic women. Based on a comparison of latent variable means, we demonstrated that observed sex/gender differences in manifest ASQoL scores were the result of statistical artifacts, a claim that was further supported by the lack of significant group differences on the sex/gender-invariant WHOQOL-4. Our findings indicate that the ASQoL composite score is psychometrically problematic in its current form, and substantial revisions may be necessary before valid and meaningful inferences can be made regarding autism-relevant aspects of QoL. LAY SUMMARY: Quality of life (QoL) is an extremely important outcome for autistic people, but many of the tools that are used to measure it does not take into account how QoL may be different for autistic people. Using data from 700 autistic adults, we examined the measurement properties of the autism spectrum quality of life form (ASQoL), a new measure of QoL designed specifically for autistic people. Our results indicate that the ASQoL shows a pronounced sex/gender bias, which causes it to underestimate QoL in autistic women. This bias needs to be eliminated before the ASQoL can be successfully used to measure QoL in the autistic population. En ligne : http://dx.doi.org/10.1002/aur.2519 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=449 [article] Assessing general and autism-relevant quality of life in autistic adults: A psychometric investigation using item response theory [Texte imprimé et/ou numérique] / Z. J. WILLIAMS, Auteur ; K. O. GOTHAM, Auteur . - p.1633-1644. Langues : Anglais (eng) in Autism Research > 14-8 (August 2021) . - p.1633-1644 Mots-clés : Adult  Autism Spectrum Disorder  Autistic Disorder  Female  Humans  Male  Psychometrics  Quality of Life  Sexism  Surveys and Questionnaires  ASQoL  autism  differential item functioning  item response theory  measurement invariance  quality of life  reliability  sex differences  validity  well-being  Roche. He also serves on the family advisory committee of the Autism Speaks Autism  Treatment Network Vanderbilt site and the autistic researcher review board of the  Autism Intervention Research Network on Physical Health (AIR-P). Katherine Gotham  has no conflicts of interest to disclose. Index. décimale : PER Périodiques Résumé : Although many interventions and services for autistic people have the ultimate goal of improving quality of life (QoL), there is relatively little research on how best to assess this construct in the autistic population, and existing scales designed for non-autistic individuals may not assess all meaningful facets of QoL in the autistic population. To address this need, the autism spectrum QoL form (ASQoL) was recently developed as a measure of the autism-relevant quality of life. However, the psychometrics of the ASQoL have not been examined beyond the authors' initial validation study, and important properties such as measurement invariance/differential item functioning (DIF) have not yet been tested. Using data from 700 autistic adults recruited from the Simons Foundation's SPARK cohort, the current study sought to perform a comprehensive independent psychometric evaluation of the ASQoL using item response theory, comparing its performance to a newly-proposed brief measure of general QoL (the WHOQOL-4). Our models revealed substantial DIF by sex and gender in the ASQoL, which caused ASQoL scores to grossly underestimate the self-reported QoL of autistic women. Based on a comparison of latent variable means, we demonstrated that observed sex/gender differences in manifest ASQoL scores were the result of statistical artifacts, a claim that was further supported by the lack of significant group differences on the sex/gender-invariant WHOQOL-4. Our findings indicate that the ASQoL composite score is psychometrically problematic in its current form, and substantial revisions may be necessary before valid and meaningful inferences can be made regarding autism-relevant aspects of QoL. LAY SUMMARY: Quality of life (QoL) is an extremely important outcome for autistic people, but many of the tools that are used to measure it does not take into account how QoL may be different for autistic people. Using data from 700 autistic adults, we examined the measurement properties of the autism spectrum quality of life form (ASQoL), a new measure of QoL designed specifically for autistic people. Our results indicate that the ASQoL shows a pronounced sex/gender bias, which causes it to underestimate QoL in autistic women. This bias needs to be eliminated before the ASQoL can be successfully used to measure QoL in the autistic population. En ligne : http://dx.doi.org/10.1002/aur.2519 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=449

Improving the measurement of alexithymia in autistic adults: a psychometric investigation and refinement of the twenty-item Toronto Alexithymia Scale / Z. J. WILLIAMS in Molecular Autism, 12 (2021)  

Public ISBD [article]  inMolecular Autism > 12 (2021) . - 20 p. Titre : Improving the measurement of alexithymia in autistic adults: a psychometric investigation and refinement of the twenty-item Toronto Alexithymia Scale Type de document : Texte imprimé et/ou numérique Auteurs : Z. J. WILLIAMS, Auteur ; K. O. GOTHAM, Auteur Article en page(s) : 20 p. Langues : Anglais (eng) Mots-clés : Adolescent  Adult  Affective Symptoms/diagnosis  Autistic Disorder/psychology  Factor Analysis, Statistical  Female  Humans  Male  Psychiatric Status Rating Scales  Psychometrics  Reproducibility of Results  Surveys and Questionnaires  Young Adult  Alexithymia  Autism  Bayesian statistics  Differential item functioning  Emotion  Factor analysis  Item response theory  Measurement  Psychometric  Reliability  Validity  Network Vanderbilt site and the autistic researcher review board of the Autism  Intervention Network for Physical Health (AIR-P). ZJW also serves as a consultant to  Roche. KOG has no competing interests. Index. décimale : PER Périodiques Résumé : BACKGROUND: Alexithymia, a personality trait characterized by difficulties interpreting one's own emotional states, is commonly elevated in autistic adults, and a growing body of literature suggests that this trait underlies a number of cognitive and emotional differences previously attributed to autism, such as difficulties in facial emotion recognition and reduced empathy. Although questionnaires such as the twenty-item Toronto Alexithymia Scale (TAS-20) are frequently used to measure alexithymia in the autistic population, few studies have attempted to determine the psychometric properties of these questionnaires in autistic adults, including whether differential item functioning (I-DIF) exists between autistic and general population adults. METHODS: We conducted an in-depth psychometric analysis of the TAS-20 in a large sample of 743 verbal autistic adults recruited from the Simons Foundation SPARK participant pool and 721 general population controls enrolled in a large international psychological study (the Human Penguin Project). The factor structure of the TAS-20 was examined using confirmatory factor analysis, and item response theory was used to further refine the scale based on local model misfit and I-DIF between the groups. Correlations between alexithymia and other clinical outcomes such as autistic traits, anxiety, and quality-of-life were used to assess the nomological validity of the revised alexithymia scale in the SPARK sample. RESULTS: The TAS-20 did not exhibit adequate global model fit in either the autistic or general population samples. Empirically driven item reduction was undertaken, resulting in an eight-item unidimensional scale (TAS-8) with sound psychometric properties and practically ignorable I-DIF between diagnostic groups. Correlational analyses indicated that TAS-8 scores meaningfully predict autistic trait levels, anxiety and depression symptoms, and quality of life, even after controlling for trait neuroticism. LIMITATIONS: Limitations of the current study include a sample of autistic adults that was overwhelmingly female, later-diagnosed, and well-educated; clinical and control groups drawn from different studies with variable measures; and an inability to test several other important psychometric characteristics of the TAS-8, including sensitivity to change and I-DIF across multiple administrations. CONCLUSIONS: These results indicate the potential of the TAS-8 as a psychometrically robust tool to measure alexithymia in both autistic and non-autistic adults. A free online score calculator has been created to facilitate the use of norm-referenced TAS-8 latent trait scores in research applications (available at http://asdmeasures.shinyapps.io/TAS8_Score ). En ligne : http://dx.doi.org/10.1186/s13229-021-00427-9 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=459 [article] Improving the measurement of alexithymia in autistic adults: a psychometric investigation and refinement of the twenty-item Toronto Alexithymia Scale [Texte imprimé et/ou numérique] / Z. J. WILLIAMS, Auteur ; K. O. GOTHAM, Auteur . - 20 p. Langues : Anglais (eng) in Molecular Autism > 12 (2021) . - 20 p. Mots-clés : Adolescent  Adult  Affective Symptoms/diagnosis  Autistic Disorder/psychology  Factor Analysis, Statistical  Female  Humans  Male  Psychiatric Status Rating Scales  Psychometrics  Reproducibility of Results  Surveys and Questionnaires  Young Adult  Alexithymia  Autism  Bayesian statistics  Differential item functioning  Emotion  Factor analysis  Item response theory  Measurement  Psychometric  Reliability  Validity  Network Vanderbilt site and the autistic researcher review board of the Autism  Intervention Network for Physical Health (AIR-P). ZJW also serves as a consultant to  Roche. KOG has no competing interests. Index. décimale : PER Périodiques Résumé : BACKGROUND: Alexithymia, a personality trait characterized by difficulties interpreting one's own emotional states, is commonly elevated in autistic adults, and a growing body of literature suggests that this trait underlies a number of cognitive and emotional differences previously attributed to autism, such as difficulties in facial emotion recognition and reduced empathy. Although questionnaires such as the twenty-item Toronto Alexithymia Scale (TAS-20) are frequently used to measure alexithymia in the autistic population, few studies have attempted to determine the psychometric properties of these questionnaires in autistic adults, including whether differential item functioning (I-DIF) exists between autistic and general population adults. METHODS: We conducted an in-depth psychometric analysis of the TAS-20 in a large sample of 743 verbal autistic adults recruited from the Simons Foundation SPARK participant pool and 721 general population controls enrolled in a large international psychological study (the Human Penguin Project). The factor structure of the TAS-20 was examined using confirmatory factor analysis, and item response theory was used to further refine the scale based on local model misfit and I-DIF between the groups. Correlations between alexithymia and other clinical outcomes such as autistic traits, anxiety, and quality-of-life were used to assess the nomological validity of the revised alexithymia scale in the SPARK sample. RESULTS: The TAS-20 did not exhibit adequate global model fit in either the autistic or general population samples. Empirically driven item reduction was undertaken, resulting in an eight-item unidimensional scale (TAS-8) with sound psychometric properties and practically ignorable I-DIF between diagnostic groups. Correlational analyses indicated that TAS-8 scores meaningfully predict autistic trait levels, anxiety and depression symptoms, and quality of life, even after controlling for trait neuroticism. LIMITATIONS: Limitations of the current study include a sample of autistic adults that was overwhelmingly female, later-diagnosed, and well-educated; clinical and control groups drawn from different studies with variable measures; and an inability to test several other important psychometric characteristics of the TAS-8, including sensitivity to change and I-DIF across multiple administrations. CONCLUSIONS: These results indicate the potential of the TAS-8 as a psychometrically robust tool to measure alexithymia in both autistic and non-autistic adults. A free online score calculator has been created to facilitate the use of norm-referenced TAS-8 latent trait scores in research applications (available at http://asdmeasures.shinyapps.io/TAS8_Score ). En ligne : http://dx.doi.org/10.1186/s13229-021-00427-9 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=459

Improving the measurement of alexithymia in autistic adults: a psychometric investigation of the 20-item Toronto Alexithymia Scale and generation of a general alexithymia factor score using item response theory / Z. J. WILLIAMS in Molecular Autism, 12 (2021)  

Public ISBD [article]  inMolecular Autism > 12 (2021) . - 56 p. Titre : Improving the measurement of alexithymia in autistic adults: a psychometric investigation of the 20-item Toronto Alexithymia Scale and generation of a general alexithymia factor score using item response theory Type de document : Texte imprimé et/ou numérique Auteurs : Z. J. WILLIAMS, Auteur ; K. O. GOTHAM, Auteur Article en page(s) : 56 p. Langues : Anglais (eng) Mots-clés : Alexithymia  Autism  Bayesian statistics  Differential item functioning  Emotion  Factor analysis  Item response theory  Measurement  Psychometric  Reliability  Validity  site and a member of the autistic researcher review board of the Autism Intervention  Network for Physical Health (AIR-P). ZJW also serves as a consultant to Roche. KOG  has no competing interests. Index. décimale : PER Périodiques Résumé : BACKGROUND: Alexithymia, a personality trait characterized by difficulties interpreting emotional states, is commonly elevated in autistic adults, and a growing body of literature suggests that this trait underlies several cognitive and emotional differences previously attributed to autism. Although questionnaires such as the 20-item Toronto Alexithymia Scale (TAS-20) are frequently used to measure alexithymia in the autistic population, few studies have investigated the psychometric properties of these questionnaires in autistic adults, including whether differential item functioning (I-DIF) exists between autistic and general population adults. METHODS: This study is a revised version of a previous article that was retracted due to copyright concerns (Williams and Gotham in Mol Autism 12:1-40). We conducted an in-depth psychometric analysis of the TAS-20 in a large sample of 743 cognitively able autistic adults recruited from the Simons Foundation SPARK participant pool and 721 general population controls enrolled in a large international psychological study. The factor structure of the TAS-20 was examined using confirmatory factor analysis, and item response theory was used to generate a subset of the items that were strong indicators of a "general alexithymia" factor. Correlations between alexithymia and other clinical outcomes were used to assess the nomological validity of the new alexithymia score in the SPARK sample. RESULTS: The TAS-20 did not exhibit adequate model fit in either the autistic or general population samples. Empirically driven item reduction was undertaken, resulting in an 8-item general alexithymia factor score (GAFS-8, with "TAS" no longer referenced due to copyright) with sound psychometric properties and practically ignorable I-DIF between diagnostic groups. Correlational analyses indicated that GAFS-8 scores, as derived from the TAS-20, meaningfully predict autistic trait levels, repetitive behaviors, and depression symptoms, even after controlling for trait neuroticism. The GAFS-8 also presented no meaningful decrement in nomological validity over the full TAS-20 in autistic participants. LIMITATIONS: Limitations of the current study include a sample of autistic adults that was majority female, later diagnosed, and well educated; clinical and control groups drawn from different studies with variable measures; only 16 of the TAS-20 items being administered to the non-autistic sample; and an inability to test several other important psychometric characteristics of the GAFS-8, including sensitivity to change and I-DIF across multiple administrations. CONCLUSIONS: These results indicate the potential of the GAFS-8 to robustly measure alexithymia in both autistic and non-autistic adults. A free online score calculator has been created to facilitate the use of norm-referenced GAFS-8 latent trait scores in research applications (available at https://asdmeasures.shinyapps.io/alexithymia ). En ligne : http://dx.doi.org/10.1186/s13229-021-00463-5 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=459 [article] Improving the measurement of alexithymia in autistic adults: a psychometric investigation of the 20-item Toronto Alexithymia Scale and generation of a general alexithymia factor score using item response theory [Texte imprimé et/ou numérique] / Z. J. WILLIAMS, Auteur ; K. O. GOTHAM, Auteur . - 56 p. Langues : Anglais (eng) in Molecular Autism > 12 (2021) . - 56 p. Mots-clés : Alexithymia  Autism  Bayesian statistics  Differential item functioning  Emotion  Factor analysis  Item response theory  Measurement  Psychometric  Reliability  Validity  site and a member of the autistic researcher review board of the Autism Intervention  Network for Physical Health (AIR-P). ZJW also serves as a consultant to Roche. KOG  has no competing interests. Index. décimale : PER Périodiques Résumé : BACKGROUND: Alexithymia, a personality trait characterized by difficulties interpreting emotional states, is commonly elevated in autistic adults, and a growing body of literature suggests that this trait underlies several cognitive and emotional differences previously attributed to autism. Although questionnaires such as the 20-item Toronto Alexithymia Scale (TAS-20) are frequently used to measure alexithymia in the autistic population, few studies have investigated the psychometric properties of these questionnaires in autistic adults, including whether differential item functioning (I-DIF) exists between autistic and general population adults. METHODS: This study is a revised version of a previous article that was retracted due to copyright concerns (Williams and Gotham in Mol Autism 12:1-40). We conducted an in-depth psychometric analysis of the TAS-20 in a large sample of 743 cognitively able autistic adults recruited from the Simons Foundation SPARK participant pool and 721 general population controls enrolled in a large international psychological study. The factor structure of the TAS-20 was examined using confirmatory factor analysis, and item response theory was used to generate a subset of the items that were strong indicators of a "general alexithymia" factor. Correlations between alexithymia and other clinical outcomes were used to assess the nomological validity of the new alexithymia score in the SPARK sample. RESULTS: The TAS-20 did not exhibit adequate model fit in either the autistic or general population samples. Empirically driven item reduction was undertaken, resulting in an 8-item general alexithymia factor score (GAFS-8, with "TAS" no longer referenced due to copyright) with sound psychometric properties and practically ignorable I-DIF between diagnostic groups. Correlational analyses indicated that GAFS-8 scores, as derived from the TAS-20, meaningfully predict autistic trait levels, repetitive behaviors, and depression symptoms, even after controlling for trait neuroticism. The GAFS-8 also presented no meaningful decrement in nomological validity over the full TAS-20 in autistic participants. LIMITATIONS: Limitations of the current study include a sample of autistic adults that was majority female, later diagnosed, and well educated; clinical and control groups drawn from different studies with variable measures; only 16 of the TAS-20 items being administered to the non-autistic sample; and an inability to test several other important psychometric characteristics of the GAFS-8, including sensitivity to change and I-DIF across multiple administrations. CONCLUSIONS: These results indicate the potential of the GAFS-8 to robustly measure alexithymia in both autistic and non-autistic adults. A free online score calculator has been created to facilitate the use of norm-referenced GAFS-8 latent trait scores in research applications (available at https://asdmeasures.shinyapps.io/alexithymia ). En ligne : http://dx.doi.org/10.1186/s13229-021-00463-5 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=459

Investigating diagnostic bias in autism spectrum conditions: An item response theory analysis of sex bias in the AQ-10 / Aja Louise MURRAY in Autism Research, 10-5 (May 2017)  

Public ISBD [article]  inAutism Research > 10-5 (May 2017) . - p.790-800 Titre : Investigating diagnostic bias in autism spectrum conditions: An item response theory analysis of sex bias in the AQ-10 Type de document : Texte imprimé et/ou numérique Auteurs : Aja Louise MURRAY, Auteur ; Carrie ALLISON, Auteur ; Paula L. SMITH, Auteur ; Simon BARON-COHEN, Auteur ; Tom BOOTH, Auteur ; Bonnie AUYEUNG, Auteur Article en page(s) : p.790-800 Langues : Anglais (eng) Mots-clés : sex differences  autism  screening  autism spectrum quotient  AQ-10  item response theory  differential item functioning  differential test functioning Index. décimale : PER Périodiques Résumé : Diagnostic bias is a concern in autism spectrum conditions (ASC) where prevalence and presentation differ by sex. To ensure that females with ASC are not under-identified, it is important that ASC screening tools do not systematically underestimate autistic traits in females relative to males. We evaluated whether the AQ-10, a brief screen for ASC recommended by the National Institute of Clinical Excellence in cases of suspected ASC, exhibits such a bias. Using an item response theory approach, we evaluated differential item functioning and differential test functioning. We found that although individual items showed some sex bias, these biases at times favored males and at other times favored females. Thus, at the level of test scores the item-level biases cancelled out to give an unbiased overall score. Results support the continued use of the AQ-10 sum score in its current form; however, suggest that caution should be exercised when interpreting responses to individual items. The nature of the item level biases could serve as a guide for future research into how ASC affects males and females differently. En ligne : http://dx.doi.org/10.1002/aur.1724 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=307 [article] Investigating diagnostic bias in autism spectrum conditions: An item response theory analysis of sex bias in the AQ-10 [Texte imprimé et/ou numérique] / Aja Louise MURRAY, Auteur ; Carrie ALLISON, Auteur ; Paula L. SMITH, Auteur ; Simon BARON-COHEN, Auteur ; Tom BOOTH, Auteur ; Bonnie AUYEUNG, Auteur . - p.790-800. Langues : Anglais (eng) in Autism Research > 10-5 (May 2017) . - p.790-800 Mots-clés : sex differences  autism  screening  autism spectrum quotient  AQ-10  item response theory  differential item functioning  differential test functioning Index. décimale : PER Périodiques Résumé : Diagnostic bias is a concern in autism spectrum conditions (ASC) where prevalence and presentation differ by sex. To ensure that females with ASC are not under-identified, it is important that ASC screening tools do not systematically underestimate autistic traits in females relative to males. We evaluated whether the AQ-10, a brief screen for ASC recommended by the National Institute of Clinical Excellence in cases of suspected ASC, exhibits such a bias. Using an item response theory approach, we evaluated differential item functioning and differential test functioning. We found that although individual items showed some sex bias, these biases at times favored males and at other times favored females. Thus, at the level of test scores the item-level biases cancelled out to give an unbiased overall score. Results support the continued use of the AQ-10 sum score in its current form; however, suggest that caution should be exercised when interpreting responses to individual items. The nature of the item level biases could serve as a guide for future research into how ASC affects males and females differently. En ligne : http://dx.doi.org/10.1002/aur.1724 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=307

Negatively phrased items of the Autism Spectrum Quotient function differently for groups with and without autism / Joost A. AGELINK VAN RENTERGEM in Autism, 23-7 (October 2019)  

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The factor structure and measurement invariance of the Autism Spectrum Quotient-28: A cross-cultural comparison between Malaysia and the Netherlands / Anke M. SCHEEREN ; Marieke DE VRIES in Autism, 28-1 (January 2024)  

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Measurement invariance of the Childhood Autism Rating Scale (CARS) across six countries / D. STEVANOVIC in Autism Research, 14-12 (December 2021)  

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