Rates of developmental and mental disabilities — ranging from speech problems to attention-deficit/hyperactivity disorder — have jumped 21% among U.S. children, according to a new report.

Overall, parent-reported disabilities rose 16% — from almost 5 million children to about 6 million between 2001 and 2011, said study author Dr. Amy Houtrow, associate professor of physical medicine and rehabilitation and pediatrics at the University of Pittsburgh.

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