A new study on the safety of hot-air balloons didn’t find any problems in Oregon, but researchers believe it may be time to consider having riders in general use safety harnesses.

The study was funded the Centers for Disease Control and Prevention.

It found that between 2000 and 2011 the National Transportation Safety Board recorded 78 balloon tour crashes. And that in those crashes five people died and 91 sustained serious injuries — many from being thrown out of the basket during a hard landing, or when the balloon hit something like a tree or a power line.

Sarah-Blythe Ballard wrote the paper for the Johns Hopkins Center for Injury Research, “There are things that could be done potentially to reduce these kinds of injuries,” she said.

“If people are dying because they’re being ejected out of these balloon, then maybe there are kinds of restraint systems or other innovations that could be made to make the sport more safe.”

Ballard said she didn’t find any crashes in Oregon during the 12-year study period. She said most accidents happened in the Southwest where there’s more ballooning, and several large ballooning events.

This story originally appeared on Oregon Public Broadcasting.