A Comparison of Autism Prevalence Trends in Denmark and Western Australia / Erik T. PARNER in Journal of Autism and Developmental Disorders, 41-12 (December 2011)  

Public ISBD [article]  inJournal of Autism and Developmental Disorders > 41-12 (December 2011) . - p.1601-1608 Titre : A Comparison of Autism Prevalence Trends in Denmark and Western Australia Type de document : Texte imprimé et/ou numérique Auteurs : Erik T. PARNER, Auteur ; Poul THORSEN, Auteur ; Glenys DIXON, Auteur ; Nicholas H. DE KLERK, Auteur ; Helen LEONARD, Auteur ; Natasha NASSAR, Auteur ; Jenny BOURKE, Auteur ; Carol BOWER, Auteur ; Emma J. GLASSON, Auteur Année de publication : 2011 Article en page(s) : p.1601-1608 Langues : Anglais (eng) Mots-clés : Autism  Autism spectrum disorders  Prevalence  Diagnosis  Denmark  Western Australia Index. décimale : PER Périodiques Résumé : Prevalence statistics for autism spectrum disorders (ASD) vary widely across geographical boundaries. Some variation can be explained by diagnostic methods, case ascertainment and age at diagnosis. This study compared prevalence statistics for two distinct geographical regions, Denmark and Western Australia, both of which have had population-based registers and consistent classification systems operating over the past decade. Overall ASD prevalence rates were higher in Denmark (68.5 per 10,000 children) compared with Western Australia (51.0 per 10,000 children), while the diagnosis of childhood autism was more prevalent in Western Australia (39.3 per 10,000 children) compared with Denmark (21.8 per 10,000 children). These differences are probably caused by local phenomena affecting case ascertainment but influence from biological or geographical factors may exist. En ligne : http://dx.doi.org/10.1007/s10803-011-1186-0 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=148 [article] A Comparison of Autism Prevalence Trends in Denmark and Western Australia [Texte imprimé et/ou numérique] / Erik T. PARNER, Auteur ; Poul THORSEN, Auteur ; Glenys DIXON, Auteur ; Nicholas H. DE KLERK, Auteur ; Helen LEONARD, Auteur ; Natasha NASSAR, Auteur ; Jenny BOURKE, Auteur ; Carol BOWER, Auteur ; Emma J. GLASSON, Auteur . - 2011 . - p.1601-1608. Langues : Anglais (eng) in Journal of Autism and Developmental Disorders > 41-12 (December 2011) . - p.1601-1608 Mots-clés : Autism  Autism spectrum disorders  Prevalence  Diagnosis  Denmark  Western Australia Index. décimale : PER Périodiques Résumé : Prevalence statistics for autism spectrum disorders (ASD) vary widely across geographical boundaries. Some variation can be explained by diagnostic methods, case ascertainment and age at diagnosis. This study compared prevalence statistics for two distinct geographical regions, Denmark and Western Australia, both of which have had population-based registers and consistent classification systems operating over the past decade. Overall ASD prevalence rates were higher in Denmark (68.5 per 10,000 children) compared with Western Australia (51.0 per 10,000 children), while the diagnosis of childhood autism was more prevalent in Western Australia (39.3 per 10,000 children) compared with Denmark (21.8 per 10,000 children). These differences are probably caused by local phenomena affecting case ascertainment but influence from biological or geographical factors may exist. En ligne : http://dx.doi.org/10.1007/s10803-011-1186-0 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=148

Evidence of a reduction over time in the behavioral severity of autistic disorder diagnoses / Andrew J. O. WHITEHOUSE in Autism Research, 10-1 (January 2017)  

Public ISBD [article]  inAutism Research > 10-1 (January 2017) . - p.179-187 Titre : Evidence of a reduction over time in the behavioral severity of autistic disorder diagnoses Type de document : Texte imprimé et/ou numérique Auteurs : Andrew J. O. WHITEHOUSE, Auteur ; Matthew N. COOPER, Auteur ; Keely BEBBINGTON, Auteur ; Gail A. ALVARES, Auteur ; Ashleigh LIN, Auteur ; John WRAY, Auteur ; Emma J. GLASSON, Auteur Article en page(s) : p.179-187 Langues : Anglais (eng) Mots-clés : autistic disorder  autism spectrum disorder  epidemiology  diagnosis  prevalence Index. décimale : PER Périodiques Résumé : The increasing prevalence of Autism Spectrum Disorders (ASD) may in part be due to a shift in the diagnostic threshold that has led to individuals with a less severe behavioral phenotype receiving a clinical diagnosis. This study examined whether there were changes over time in the qualitative and quantitative phenotype of individuals who received the diagnosis of Autistic Disorder. Data were from a prospective register of new diagnoses in Western Australia (n?=?1252). From 2000 to 2006, we examined differences in both the percentage of newly diagnosed cases that met each criterion as well as severity ratings of the behaviors observed (not met, partially met, mild/moderate and extreme). Linear regression determined there was a statistically significant reduction from 2000 to 2006 in the percentage of new diagnoses meeting two of 12 criteria. There was also a reduction across the study period in the proportion of new cases rated as having extreme severity on six criteria. There was a reduction in the proportion of individuals with three or more criteria rated as extreme from 2000 (16.0%) to 2006 (1.6%), while percentage of new cases with no “extreme” rating on any criteria increased from 58.5% to 86.6% across the same period. This study provides the first clear evidence of a reduction over time in the behavioral severity of individuals diagnosed with Autistic Disorder during a period of stability in diagnostic criteria. A shift toward diagnosing individuals with less severe behavioral symptoms may have contributed to the increasing prevalence of Autistic Disorder diagnoses. En ligne : http://dx.doi.org/10.1002/aur.1740 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=303 [article] Evidence of a reduction over time in the behavioral severity of autistic disorder diagnoses [Texte imprimé et/ou numérique] / Andrew J. O. WHITEHOUSE, Auteur ; Matthew N. COOPER, Auteur ; Keely BEBBINGTON, Auteur ; Gail A. ALVARES, Auteur ; Ashleigh LIN, Auteur ; John WRAY, Auteur ; Emma J. GLASSON, Auteur . - p.179-187. Langues : Anglais (eng) in Autism Research > 10-1 (January 2017) . - p.179-187 Mots-clés : autistic disorder  autism spectrum disorder  epidemiology  diagnosis  prevalence Index. décimale : PER Périodiques Résumé : The increasing prevalence of Autism Spectrum Disorders (ASD) may in part be due to a shift in the diagnostic threshold that has led to individuals with a less severe behavioral phenotype receiving a clinical diagnosis. This study examined whether there were changes over time in the qualitative and quantitative phenotype of individuals who received the diagnosis of Autistic Disorder. Data were from a prospective register of new diagnoses in Western Australia (n?=?1252). From 2000 to 2006, we examined differences in both the percentage of newly diagnosed cases that met each criterion as well as severity ratings of the behaviors observed (not met, partially met, mild/moderate and extreme). Linear regression determined there was a statistically significant reduction from 2000 to 2006 in the percentage of new diagnoses meeting two of 12 criteria. There was also a reduction across the study period in the proportion of new cases rated as having extreme severity on six criteria. There was a reduction in the proportion of individuals with three or more criteria rated as extreme from 2000 (16.0%) to 2006 (1.6%), while percentage of new cases with no “extreme” rating on any criteria increased from 58.5% to 86.6% across the same period. This study provides the first clear evidence of a reduction over time in the behavioral severity of individuals diagnosed with Autistic Disorder during a period of stability in diagnostic criteria. A shift toward diagnosing individuals with less severe behavioral symptoms may have contributed to the increasing prevalence of Autistic Disorder diagnoses. En ligne : http://dx.doi.org/10.1002/aur.1740 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=303

Unpacking the complex nature of the autism epidemic / Helen LEONARD in Research in Autism Spectrum Disorders, 4-4 (October-December 2010)  

Public ISBD [article]  inResearch in Autism Spectrum Disorders > 4-4 (October-December 2010) . - p.548-554 Titre : Unpacking the complex nature of the autism epidemic Type de document : Texte imprimé et/ou numérique Auteurs : Helen LEONARD, Auteur ; Andrew J. O. WHITEHOUSE, Auteur ; Glenys DIXON, Auteur ; Jenny BOURKE, Auteur ; Karina AIBERTI, Auteur ; Natasha NASSAR, Auteur ; Carol BOWER, Auteur ; Emma J. GLASSON, Auteur Année de publication : 2010 Article en page(s) : p.548-554 Langues : Anglais (eng) Mots-clés : Autistic-disorder Autism Autism-spectrum-disorder Diagnosis Intellectual-disability Autism-epidemic Index. décimale : PER Périodiques Résumé : The etiology of autism spectrum disorders is unknown but there are claims of increasing prevalence in many countries. Despite more than a decade of epidemiological investigation, it is still unclear whether the rising trend in prevalence reflects a true increase or changes in diagnostic trends and improvements in case ascertainment. This paper discusses changes in diagnostic criteria, decreasing age at diagnosis, improved case ascertainment, diagnostic substitution, and social and cultural influences on the overall effects on prevalence, including the role of an ASD diagnosis as a gateway to funding. The evidence suggests that the increased prevalence of autism spectrum disorder can be partly supported by each of these factors, but remains largely unquantified due to a variety of other global and local factors. The question of how much of a real increase in prevalence has occurred remains crucially important to understand the classification, epidemiology and etiology of autism spectrum disorders but can only be answered if controlling these other factors. En ligne : http://dx.doi.org/10.1016/j.rasd.2010.01.003 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=102 [article] Unpacking the complex nature of the autism epidemic [Texte imprimé et/ou numérique] / Helen LEONARD, Auteur ; Andrew J. O. WHITEHOUSE, Auteur ; Glenys DIXON, Auteur ; Jenny BOURKE, Auteur ; Karina AIBERTI, Auteur ; Natasha NASSAR, Auteur ; Carol BOWER, Auteur ; Emma J. GLASSON, Auteur . - 2010 . - p.548-554. Langues : Anglais (eng) in Research in Autism Spectrum Disorders > 4-4 (October-December 2010) . - p.548-554 Mots-clés : Autistic-disorder Autism Autism-spectrum-disorder Diagnosis Intellectual-disability Autism-epidemic Index. décimale : PER Périodiques Résumé : The etiology of autism spectrum disorders is unknown but there are claims of increasing prevalence in many countries. Despite more than a decade of epidemiological investigation, it is still unclear whether the rising trend in prevalence reflects a true increase or changes in diagnostic trends and improvements in case ascertainment. This paper discusses changes in diagnostic criteria, decreasing age at diagnosis, improved case ascertainment, diagnostic substitution, and social and cultural influences on the overall effects on prevalence, including the role of an ASD diagnosis as a gateway to funding. The evidence suggests that the increased prevalence of autism spectrum disorder can be partly supported by each of these factors, but remains largely unquantified due to a variety of other global and local factors. The question of how much of a real increase in prevalence has occurred remains crucially important to understand the classification, epidemiology and etiology of autism spectrum disorders but can only be answered if controlling these other factors. En ligne : http://dx.doi.org/10.1016/j.rasd.2010.01.003 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=102

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