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Dates: during 2000-2009
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But as striking as the new figure is, it's not clear how much of the rise reflects a true increase in ASD risk and how much is due simply to improved awareness and diagnosis of the disorders. Increased access to special education classes and other therapies may also be...
"This is going to be a complicated story," Rice told TIME, referring to the ongoing task of identifying reasons for the increase. "We know we're not going to get a single answer. But we can use these data sets in addition to all the other research going on to...
Previous studies looking at a narrower population of youngsters have suggested that as much as 40% of the rise in autism cases might be explained by broader diagnostic definitions and by heightened awareness of the condition. But that still leaves 60% of the increase unaccounted for. "Most scientists believe there...
So, what is driving the soaring numbers? While recent studies have highlighted genetic changes that might be responsible, some experts caution that such changes happen over time, far too slowly to explain the recent rise in autism. "When you see an increase like this, you have to think it's...
Since autism is generally diagnosed before age two, most scientists believe the factors that contribute to ASD occur during pregnancy, or in the months immediately following birth. A pregnant mother's advanced age might be one such influence, along with certain behavioral and environmental exposures she or her newborn baby...