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J Autism Dev Disord. 2015 Jun;45(6):1766-73. doi: 10.1007/s10803-014-2336-y.

Changes in prevalence of autism spectrum disorders in 2001-2011: findings from the Stockholm youth cohort.

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Department of Public Health Sciences, Karolinska Institutet, Widerströmska Huset, Tomtebodavägen 18A, 171 77, Stockholm, Sweden,


In a record-linkage study in Stockholm, Sweden, the year 2011 prevalence of diagnosed autism spectrum disorders (ASD) was found to be 0.40, 1.74, 2.46, and 1.76% among 0-5, 6-12, 13-17, and 18-27 year olds, respectively. The corresponding proportion of cases with a recorded diagnosis of intellectual disability was 17.4, 22.1, 26.1 and 29.4%. Between 2001 and 2011, ASD prevalence increased almost 3.5 fold among children aged 2-17 years. The increase was mainly accounted for by an eightfold increase of ASD without intellectual disability (from 0.14 to 1.10 %), while the prevalence of ASD with intellectual disability increased only slightly (from 0.28 to 0.34%). The increase in ASD prevalence is likely contributed to by extrinsic factors such as increased awareness and diagnostics.

[Indexed for MEDLINE]

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