Is autism really on the rise?

Ellen Hanson, Ph.D.

“Has autism increased or hasn’t it?” As a researcher and psychologist with a specialty in developmental disabilities and autism spectrum disorders (ASDs), this is a question I get all the time. I wish I had a short answer, but I don’t. On the other hand, if you have a few minutes, read on.

The question is a really important one. A study just came out in Pediatrics, saying that the prevalence of ASDs is now one in 91 U.S. children – and one in 58 boys. This is much higher than the most recently quoted rate of one in 150. And that is up from one in 1500 in the early 1990s.

That jump would scare anyone! But is it real?

This should be a “yes” or “no” question, right? But the first thing to remember is that, although we do our best, it can be really difficult for researchers to get good autism numbers. Previous studies looking at this issue have used differing criteria for deciding who has an ASD. Some studies try to use particular criteria to “make sure” that the individual has an ASD and not some other disorder – for example, requiring that the diagnosis come from a specialist, or that the patient displays certain symptoms. In contrast, the study in Pediatrics used parent or guardian reports and got a much higher rate of diagnosis. This isn’t necessarily because the parents were inaccurate, but rather that they could report a diagnosis or an observation made by any provider using any set of rules or criteria.

Another issue is that reporting of disorders can rise for reasons other than a true increase. For example, when there are treatments that work and are available, people are more likely to pursue getting a diagnosis. In the case of ASDs, when laws were enacted to ensure that young children had more access to services, there was an increase in diagnosis.

Yet another factor is increased public awareness. When you know that you have risk factors for a disorder, you are more likely to be evaluated. And as awareness increases, people tend to get diagnosed much earlier, adding to the pool of people who have the diagnosis at any given time.

After all this, you’re probably still saying, “So, do we know if ASDs have increased at all?” And truthfully, we just don’t have a definitive answer. Certainly there is an increase in prevalence, or the number of people diagnosed with an ASD at any given time. The incidence of ASDs, or the number of new cases over a certain time span, is less clear. But even when the reporting issues above are taken into account, new cases do appear to be increasing.

Why this is so remains a big mystery. Children’s Hospital Boston is one of the institutions trying to find answers – using very stringent, rigorous methods for diagnosing autism and analyzing the data so we can look for causes, improved diagnostic techniques, better treatments and ultimately cures. If you have a child with autism, we need your help! Consider enrolling in our study, which looks at the genetics of autism, or other studies taking place at the hospital (for more information, email Anna Ehler or call 617-355-3076). You’ll get a report on your child and you’ll be helping researchers make new discoveries. Whether it’s one in 150 or one in 91, ASDs are a huge public health problem, and we need answers quickly.

Courtesy of Children's Hospital Boston

Related Articles

"I don't care" and autism

"I don't care!" is a heavy topic to cover in a blog but here is my shot at it: Many kids say "I don't care, ..

read more

The 21st century speech language pathologist

Today’s speech language pathologists (SLPs) play many roles as they attempt to support the development of sp ..

read more

Preparing for the transition to adulthood (Part 3)

Finally, in the third part of this blog on the transition to adulthood, I felt a letter I received from a pare ..

read more

Our Support Community

Join our free support community and connect with thousands of other families and individuals touched by ASD. Find out what’s working for others, coping strategies, and life guides from others living what you’re going through now. Click here to join for free!

Resources in Your Area

Looking for autism resources nearby? Check our listings for professionals and services that might help.

Post your services | Help out in general


9th World Rett Syndrome Congress
Surfers Paradise, QLD - Australia
Sep-30-2020 - 09:00 am
The Rett Syndrome Association of Australia (RSAA)email rettaust@bigpond.comwishes to draw attention to the fact that it is staging the 9th World Rett Syndrome Congress i ..
Go to Event site

view all events