Sharp rise in autism in just 4 years

The new estimates are based on the evaluation of health and education records of 307,790 children aged eight years, from 11 communities comprising 8 percent of the U.S. population.

The researchers found that on an average, one in 110 children or approximately 1 percent are afflicted with the disorder.

The new figures also indicate autism occurs more frequently in boys than girls. According to the statistics, ASD prevalence shot up by 60 percent in boys as opposed to 48 percent in girls since 2002.

In addition, autism among Hispanic children rose 90 percent, among white youths 55 percent, and among black children 41 percent.

Reasons for the increase in numbers
According to experts there is no single factor or explanation that can be attributed to the increase in numbers of ASD, though an increased awareness of the condition could be one reason.

Experts believe since the disorder is generally diagnosed before two years, it could be linked to pregnancy or to the months immediately following birth.

In addition, premature birth, infections the mother may have incurred during pregnancy, childbirth complications, prenatal exposure to environmental toxins and dietary factors may be responsible for the surge in cases.

Other contributing factors could be a rise in the average age at which women conceive or certain behavioral exposures she or her newborn baby may experience.

Catherine Rice, lead author of the CDC report stated, "These new numbers are concerning. We're struggling to find answers. We know complex genetic and environmental factors are involved, and we have much to learn about the causes."

Surge in autism cause for concern
The recent report has confirmed that autism is becoming a national health crisis, an issue that requires research and funding.

Geraldine Dawson, PhD, chief science officer of advocacy group Autism Speaks stated, "There are too many children with autism who are being diagnosed at six, seven or even eight years of age, which is far too late for them to experience the maximum benefits of early intervention services.

"Clearly, we need to do a better job of diagnosing children as early as possible - ideally by age two. We know that early intervention can make a critical difference in a child's outcome."

Autism Spectrum Disorders
Autism is a neurobiological disorder that causes severe and pervasive impairment in the ability to communicate and relate to others.

The disorder is usually first diagnosed in early childhood. The causes for the condition are unclear though researchers believe environmental, biologic and genetic factors play a role.

There is no medical test for this complex biological condition. Parents and doctors work together to analyze a child's behavior and development to make a diagnosis.