Etwa 3 % der Schulkinder weisen sowohl Symptome von Autismus als auch von ADHS auf. Etwa 33 % der autistischen Kinder und 31 % derjenigen mit Autismus-Symptomen, die die diagnostische Schwelle nicht erreichen, hatten auch ADHS. Darüber hinaus hatten 10 % der Kinder mit ADHS auch Autismus.

I’ve linked to the news release in the post above. In this comment, for those interested, here’s the link to the peer reviewed journal article:

https://onlinelibrary.wiley.com/doi/10.1002/aur.3146

From the linked article:

A study in Spain found that around 3% of schoolchildren exhibit symptoms of both autism and attention-deficit/hyperactivity disorder (ADHD). Approximately 0.5% of children could be diagnosed with both disorders. About 33% of autistic children and 31% of those with autism symptoms that do not reach the diagnostic threshold also had ADHD. Additionally, 10% of children with ADHD also had autism. The paper was published in Autism Research.

The results showed that around 3% of children had symptoms of both autism and ADHD. The co-occurrence of autism and ADHD was much higher in boys than in girls—4–5% vs. 1–2%, depending on whether the diagnosis was based on information from parents or teachers. The study authors estimated that around 0.5% of children could be formally diagnosed with both disorders.

Thirty-three percent of children with autism also had ADHD, with the rate being higher among older children (46%) compared to younger ones (22%). Ten percent of children with ADHD also had autism, with the percentage being somewhat higher among younger children (16%) than older children (8%). However, it remains unclear if this difference is due to random variation. An additional 6% of children with autism showed symptoms of ADHD that did not reach the diagnostic threshold.

“Autism and attention deficit hyperactivity disorder (ADHD) frequently coexist, but prevalence reports exhibit significant variability based on population characteristics and assessment methods. In the present study, parents and teachers reported a similar 3% prevalence of autism and ADHD traits, with an estimated comorbid diagnosis prevalence of 0.5%. Only 16% of the children had received prior diagnoses for both conditions, although parents and teachers identified traits of autism and ADHD in almost all cases. Based on the findings, early screening for co-occurring autism and ADHD in both school and family settings is recommended,” the study authors concluded.

Worth remembering that this is according to the diagnostic standards they used, under the pathology model. Other diagnostic standards and paradigms will yield different results.