Autism on the rise

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Docs:

FYI. (Comments from Sunny?) :-)

Lyndon McGill, D.C.

EvolvHealth Wellness Advisory Council Member

Salem, Oregon

www.SalemSpineClinic.com

www.EvolvingDaily.com

Autism Prevalence Up 78% in the US

Reasons for Increase Unclear

Caroline Cassels

March 29, 2012 — The prevalence of autism spectrum disorders

(ASDs) has increased by 78% since 2002, a new report from the

Centers for Disease Control and Prevention (CDC) shows. However,

the exact reason for this increase is unclear.

Overall, the report's data, derived from the Autism and

Developmental Disabilities Monitoring (ADDM) surveillance network,

show that in 2008, 1 in 88 children aged 8 years — 1 in 54 boys

and 1 in 252 girls — had an ASD diagnosis by age 8, a significant

jump from the current estimate of 1 in 110.

This marks an estimated 23% increase since the last report in

2009 and a 78% increase since 2002. According to the CDC, some of

this increase can be attributed to the way children with ASD are

identified, diagnosed, and served in their communities, although

exactly how much is due to these factors is unknown.

"These data confirm that the estimated prevalence of ASDS

identified in the ADDM network surveillance populations continues

to increase. The extent to which these increases reflect better

case ascertainment as a result of increases in awareness and

access to services or true increases in prevalence of ASD symptoms

is not known," the report authors write.

The study is published in the March 30 issue of the CDC

publication Morbidity and Mortality Weekly Report.

"To understand more, we need to keep accelerating our research

into risk factors and causes of autism spectrum disorders," Coleen

Boyle, PhD, MSHyg, director of CDC's National Center on Birth

Defects and Developmental Disabilities, said in a statement.

The study also shows that more children are being diagnosed by

age 3, an increase from 12% for children born in 1994 to 18% for

children born in 2000.

"Unfortunately, 40% of the children in this study aren't getting

a diagnosis until after age 4. We are working hard to change

that," said Dr. Boyle.

Released today, the findings are based on data from the ADDM

network, an active surveillance system that estimates the

prevalence of ASDs of 8-year-old children at 14 sites in the

United States.

The network focuses on 8-year-olds because a baseline CDC study

revealed that this is the peak age of identified prevalence.

The report provides updated ASD prevalence estimates from the

2008 surveillance year. In addition to prevalence estimates, it

describes the characteristics of children with ASDs and compares

2008 surveillance-year findings with those from the 2002 and 2006

surveillance years.

For 2008, the overall estimated prevalence was 11.3 per 1,000

among children aged 8 years. The investigators report that there

was wide variation in overall ASD prevalence across the 14

surveillance sites; prevalence ranged from 1 in 210 children in

Alabama to 1 in 47 children in Utah.

Further, there was wide variation in prevalence estimates by sex

and race and ethnic group. Boys were 5 times more likely than

girls to have an ASD diagnosis. The largest increases were among

Hispanic and black children.

"One thing the data tells us with certainty — there are many

children and families who need help. We must continue to track

autism spectrum disorders because this is the information

communities need to guide improvements in services to help

children," CDC Director Frieden, MD, MPH, said in a

statement.

MMWR. 2012;61:1-24.

Medscape Medical News © 2012 WebMD, LLC

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