A Comparison of Autism Prevalence Trends in Denmark and Western Australia

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.

[1]  E. Glasson.  The Western Australian Register for Autism Spectrum Disorders , 2002, Journal of paediatrics and child health.

[2]  Janet B W Williams,et al.  Diagnostic and Statistical Manual of Mental Disorders , 2013 .

[3]  F. Stanley,et al.  A population database for maternal and child health research in Western Australia using record linkage. , 1994, Paediatric and perinatal epidemiology.

[4]  E. Fombonne.  Epidemiology of Pervasive Developmental Disorders , 2009, Pediatric Research.

[5]  H. Leonard,et al.  IDEA (Intellectual Disability Exploring Answers): A population-based database for intellectual disability in Western Australia , 2005, Annals of human biology.

[6]  Donna Spiegelman,et al.  Prenatal risk factors for autism: comprehensive meta-analysis , 2009, British Journal of Psychiatry.

[7]  C. Rice.  Prevalence of autism spectrum disorders - Autism and Developmental Disabilities Monitoring Network, United States, 2006. , 2009, Morbidity and mortality weekly report. Surveillance summaries.

[8]  Mark F Blaxill,et al.  What's Going on? The Question of Time Trends in Autism , 2004, Public health reports.

[9]  Eric Fombonne,et al.  Epidemiology of autistic disorder and other pervasive developmental disorders. , 2005, The Journal of clinical psychiatry.

[10]  P. Bolton,et al.  Prevalence of autism-spectrum conditions: UK school-based population study , 2009, British Journal of Psychiatry.

[11]  E. Glasson,et al.  Management of assessments and diagnoses for children with autism spectrum disorders: the Western Australian model , 2008, The Medical journal of Australia.

[12]  D. Schendel,et al.  Autism prevalence trends over time in Denmark: changes in prevalence and age at diagnosis. , 2008, Archives of pediatrics & adolescent medicine.

[13]  Cynthia D. Zubritsky,et al.  Factors Associated With Age of Diagnosis Among Children With Autism Spectrum Disorders , 2005, Pediatrics.

[14]  H. Leonard,et al.  Autism spectrum disorders in young children: effect of changes in diagnostic practices. , 2009, International journal of epidemiology.

[15]  E. Glasson,et al.  Obtaining consent affects the value of the Western Australian autism register , 2004, The Medical journal of Australia.

[16]  P. Mortensen,et al.  The Danish Psychiatric Central Register. , 1997, Danish medical bulletin.