The national database of autism spectrum disorders reveals a cumulative incidence of 2.75%

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Analysis using a national medical database revealed that the cumulative incidence of autism spectrum disorders (ASD) in children born in 2009-2014 was 2.75% at the age of five. A research group led by Associate Professor Daimei Sasayama and Professor Hideo Honda of the Department of Child and Adolescent Developmental Psychiatry at Shinshu University School of Medicine, used a national medical database to analyze the disorders of autism spectrum in Japan. It was reported that the cumulative incidence showed an increasing trend for each year of birth and that there were regional differences.

This cumulative incidence of ASD is the highest in the world based on , suggesting a high diagnostic sensitivity in Japan. The proportion of people diagnosed with autism has increased globally over the past 20 years, with a 2014 U.S. survey reporting a 1.68% prevalence in 8-year-olds. In addition, a regional cohort study on child mental development and psychiatry at Shinshu University School of Medicine reported that 3.1% of children had been diagnosed with autism spectrum disorders at school age. . Improving the accuracy of screening is one of the main reasons why more and more people are being diagnosed with autism spectrum disorders. In order to investigate the actual state of the diagnosis of in Japan, the group investigated the cumulative incidence of autism spectrum disorder nationwide and the cumulative incidence by prefecture using the National Database (NDB), which groups medical data from across the country.

For children born in 2009-2016 and diagnosed with autism spectrum disorder between 2009 and 2019, information on gender, year and age at the time of diagnosis and the prefecture where the diagnosis was made was extracted from NDB. . The cumulative incidence was calculated by dividing the number of diagnoses by the number of births each year.

Of the children born from 2009 to 2016, 313,353 (236,386 boys, 76,967 girls) were diagnosed with autism spectrum disorder between 2009 and 2019. The cumulative incidence of autism spectrum disorders in the life of 5 years in children born between 2009 and 2014 was 2.75%. The cumulative incidence tends to increase with each year of birth. By prefecture, the cumulative incidence in life of autism spectrum disorders at the age of 5 ranged from 0.9 to 7.9% (mean 2.4%).

This study is published in the journal JAMA network open reported that the cumulative incidence of autism spectrum disorders in Japan is high worldwide. It is believed that nationally is influenced by the recent rise in awareness about autism spectrum disorders. On the other hand, since there are large ones in the incidence rate, factors such as differences in access to health care and support may also affect the incidence rate. The results of this study show that there is a growing need to build a support system for autism spectrum disorders. Accurately capturing changes in the frequency of autism spectrum disorders is important both for the realization of an effective support system and for studying risk factors and the etiology of autism spectrum disorders. The research group will continue to investigate trends in the incidence of spectrum disorders in Japan and around the world.


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More information:
Daimei Sasayama et al, Trends in Autism Spectrum Disorder Diagnoses in Japan, 2009-2019, JAMA network open (2021). DOI: 10.1001 / jamanetworkopen.2021.9234

Provided by Shinshu University

Citation: National Autism Spectrum Disorders Database Reveals Cumulative Incidence of 2.75% (2021, May 27) Retrieved May 27, 2021 at https://medicalxpress.com/news/2021-05 -autism-spectrum-disorder-national-database.html

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