(CNN) As electric scooters become increasingly ubiquitous in cities, so are scooter-related injuries, one study reports.

A study out of the University of California, San Francisco published Wednesday in JAMA Surgery, found that the number of scooter-related injuries in the country between 2014 and 2018 grew by 222% to more than 39,000 injuries. Meanwhile, the number of hospital admissions went up by 365% to nearly 3,300.

There was a dramatic jump of injuries between 2017 and 2018, according to the study. In 2017, there were 8,016 injuries. The following year, there were 14,651.

It also found that a third of the patients had head trauma, double the rate of injuries bicyclists face.

Benjamin Breyer, a senior author on the study, called the high proportion of head injuries "very dangerous" in a statement.

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