PHILADELPHIA (CBS) – Parents have been saying it for years: Trampolines are dangerous.

But just how dangerous?

According to a new study that examined data from the National Electronic Injury Surveillance System, there were 1,002,735 emergency department visits for trampoline-related injuries between 2002 and 2011.

Twenty-nine-percent of those were fracture injuries, and the average age of kids who sustained fractures was 9.5 years.

What’s more, 92.7% of those injuries were in children 16 or younger, and 95% had occurred at home.

Researchers also say trampoline fractures usually involve the upper extremity and that the “financial burden to society is large.”

The study was published in March 2014 in the Journal of Pediatric Orthopaedics.

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