As many as one in 68 U.S. children may have autism, U.S. health officials said on Thursday, a sharp increase over an estimate of 1 in 88 children just two years ago that raises questions about why the number has risen so dramatically, according to The Washington Post.
Researchers at the U.S. Centers for Disease Control and Prevention noted in their report that the data, gleaned from a study of children in 11 communities, could not be generalized to the national population, the Post reported.
In the latest report, almost half of children identified as having autism also had average or above-average IQ levels, compared with just a third of children a decade ago, according to the Post.
In its latest report, the CDC studied medical, school and other records of 8-year-olds within 11 U.S. communities to determine whether a child had autism, according to the Post.
There were significantly different rates by region, ranging from 1 in 175 children in Alabama to 1 in 45 children in New Jersey, which could reflect access to healthcare and other factors, the Post reported.
The current study looked at fewer sites than the data reported in 2012, which included 14 communities, but the CDC said it did not change the criteria used to diagnose autism, according to the Post.
This latest report looks at data from 2010 and the researchers found 14.7 per 1,000 eight-year-olds had autism, compared with the previous estimate of 11.3 per 1,000 eight year olds in its 2012 estimate, which used data from 2008, the Post reported.
The CDC said the latest data continue to show that autism is almost five times more common among boys than girls, affecting 1 in 42 boys versus 1 in 189 girls, according to the Post. White children are more likely to be identified as having autism spectrum disorder than are black or Hispanic children.
