Statistics: how many people have autism spectrum disorders? - | autism | Asperger syndr... - 0 views
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The latest prevalence studies of autism indicate that 1.1% of the population in the UK may have autism. This means that over 695,000 people in the UK may have autism, an estimate derived from the 1.1% prevalence rate applied to the 2011 UK census figures.
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Emerson and Baines (2010) in their meta-analysis of prevalence studies found a range of people with learning disabilities and autism from 15% to 84%, with a mean of 52.6%.
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Around a third of people with a learning disability may also have autism.
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The NHS Information Centre, Community and Mental Health Team, Brugha et al.(2012), found between 31% and 35.4% of people with a learning disability have autism.
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Baird et al (2006) found a male to female ratio of 3.3:1 for the whole spectrum in their sample. The Adult Psychiatric Morbidity Survey looked at people in private households, and found a prevalence rate of 1.8% male compared with 0.2% female, (Brugha et al, 2009). However, when they extended the study to include those people with learning disabilities who had been unable to take part in the APMS in 2007 and those in communal residential settings, they found that the rates for females were much closer to those of the males in the learning disabled population, (The NHS Information Centre, Community and Mental Health Team, Brugha et al., 2012).
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For over 30 years, Sula Wolff, in Edinburgh, has studied children of average or high ability who are impaired in their social interaction but who do not have the full picture of the triad of impairments
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more than 50 years since Leo Kanner first described his classic autistic syndrome
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The specific pattern of abnormal behaviour first described by Leo Kanner is also known as 'early infantile autism'. Kanner made no estimate of the possible numbers of people with this condition but he thought that it was rare (Kanner, 1943).
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autism spectrum disorders are under-diagnosed in females, and therefore the male to female ratio of those who have autism may be closer than is indicated by the figure of 5:1. The under recognition of autism spectrum disorders in females is discussed in Gould and Ashton-Smith (2011)
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the clinical picture overlaps with Asperger syndrome to a large extent. However, these children represent the most subtle and most able end of the autism spectrum. The majority become independent as adults, many marry and some display exceptional gifts, though retaining the unusual quality of their social interactions
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they often have a difficult time at school and they need recognition, understanding and acceptance from their parents and teachers. The approach that suits them best is the same as that which is recommended for children with Asperger syndrome and high-functioning autism.
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Autism and Developmental Disabilities Monitoring Network Surveillance Year 2008 Principal Investigators (2012) Prevalence of autism spectrum disorders - autism and developmental disabilities monitoring network, 14 sites, United States, 2008. Morbidity and Mortality Weekly Report. Surveillance summaries, 61(3), pp. 1-19. Available to download at http://www.cdc.gov/mmwr/preview/mmwrhtml/ss6103a1.htm [Accessed 15/05/2013]
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http://www.autism.org.uk/about-autism/myths-facts-and-statistics/statistics-how-many-people-have-autism-spectrum-disorders.aspx The word 'autism' was first used by Leo Kanner in the term 'early infantile autism' which was used to describe a specific pattern of abnormal behaviour.
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The Autism and Developmental Disabilities Monitoring Network in the USA looked at 8 year old children in 14 states in 2008, and found a prevalence rate of autism spectrum disorders within those states overall of 1 in 88, with around five times as many boys as girls affected (Autism and Developmental Disabilities Monitoring Network Surveillance Year 2008 Principal Investigators, 2012).
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The National Center for Health Statistics in the USA published findings from telephone surveys of parents of children aged 6-17 undertaken in 2011-12. The report showed a prevalence rate for ASD of 1 in 50, (Blumberg, S .J. et al, 2013).
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2.64% was found in a study done in South Korea, where the researchers found two thirds of the ASD cases were in the mainstream school population, and had never been diagnosed before., (Kim et al, 2011).
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both the increase in estimates over time and the variability between countries and regions are likely to be because of broadening diagnostic criteria, diagnostic switching, service availability and awareness of ASD among professionals and the public, (Elsabbagh M. et al, 2012).
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The Department of Health then funded a project to build on the APMS study and look more closely at the numbers of adults with autism that could not have been included in the original study. This included people in residential care settings and those with a more severe learning disability. The study was led by Professor Terry Brugha of the University of Leicester, who also led on autism research for the APMS 2007. Combining its findings with the original APMS, it found that the actual prevalence of autism is approximately 1.1% of the English population, (The NHS Information Centre, Community and Mental Health Team, Brugha, T. et al., 2012)
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Blumberg, S. J. et al (2013) Changes in prevalence of parent-reported autism spectrum disorder in school-aged U.S. children: 2007 to 2011–2012. National Health Statistics Reports, No 65. Available to download at http://www.cdc.gov/nchs/data/nhsr/nhsr065.pdf [Accessed 15/05/2013]
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Emerson, E. and Baines, S. (2010) The estimated prevalence of autism among adults with learning disabilities in England. Stockton-on-Tees: Improving Health and Lives. Available to download at http://www.improvinghealthandlives.org.uk/projects/autism [Accessed 10/05/2013]
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Idring, S. et al. (2012) Autism spectrum disorders in the Stockholm Youth Cohort: design, prevalence and validity. PLoS One, 7(7): e41280 Available to download at http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3401114/ [Accessed 15/05/2013]
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Elsabbagh, M. et al (2012) Global prevalence of autism and other pervasive developmental disorders. Autism Research, 5 (3), pp.160-179. Available to download at http://onlinelibrary.wiley.com/doi/10.1002/aur.239/pdf [Accessed 15/05/2013]
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World Health Organisation. (1992). International Classification of Diseases. 10th ed. Geneva: WHO.