The playground may be more dangerous than some think.

The Centers for Disease Control and Prevention report that emergency rooms in the United States treated approximately 21,000 children ages fourteen and younger with brain injuries that occurred on or near playgrounds between 2001 and 2013.

The statistics case concern because they come on the heels of efforts by many playground designers and equipment manufacturers taking a greater interest in improved safety features and design.

The equipment cited most frequently by the CDC includes swings, monkey bars, and gyms.

Approximately sixty-percent of the injuries happened at schools, child care centers, and recreational centers.