Observed prevalence of autism spectrum disorders in two Norwegian counties
ABSTRACT Background: The prevalence of autism spectrum disorders (ASD) has previously been reported
to be increasing dramatically in European and non-European countries. No similar
increase in prevalence rates has been documented in Norway to date. The current study
reports on ASD prevalence rates in two Norwegian counties.
Methods: The population comprised 31 015 children, ages six to 12. Information about
special needs services was provided by the school authorities and the public health service.
Multiple search strategies were applied to identify children at risk of ASD or diagnosed with
ASD. Hospital registers were searched and a mapping tool was used in all local schools.
Results: The total number of patients with ASD found in the population was 158. This gives
a prevalence of 51 per 10 000 (95% CI, 0.43e0.59).
Conclusion: Compared with the previously reported prevalence of ASD in Norway, there has
been almost a fourfold increase in the occurrence of childhood autism and a tenfold increase
in the occurrence of all ASD groups. These findings have significant implications for
designing and dimensioning appropriate intervention programmes for children with ASD
and their families.
- SourceAvailable from: Jens Egeland[show abstract] [hide abstract]
ABSTRACT: Symptoms similar to those found in Attention-Deficit/Hyperactivity Disorder (ADHD) often occur in children with Autism Spectrum Disorders (ASD). The objective of the current study was to compare verbal working memory, acquisition and delayed recall in children with High-Functioning Autism (HFA) to children with ADHD and typically developing children (TDC). Thirty-eight children with HFA, 79 with ADHD and 50 TDC (age 8-17) were assessed with a letter/number sequencing task and a verbal list-learning task. To investigate the possible influence of attention problems in children with HFA, we divided the HFA group into children with (HFA+) or without (HFA-) "attention problems" according to the Child Behaviour Checklist 6-18. The children with HFA+ displayed significant impairment compared to TDC on all three neurocognitive measures, while the children with HFA- were significantly impaired compared to TDC only on the working memory and acquisition measures. In addition, the HFA+ group scored significantly below the HFA- group and the ADHD group on the verbal working memory and delayed recall measures. The results support the proposition that children with HFA+, HFA-, and ADHD differ not only on a clinical level but also on a neurocognitive level which may have implications for treatment.PLoS ONE 01/2013; 8(5):e64842. · 3.73 Impact Factor