A recent study has revealed children in booster seats are twice as likely to suffer serious injury or death in a car crash than younger children.

Researchers from the University of Michigan found that parents are less likely to have booster seats inspected for safety, despite free inspection stations available in Michigan. In fact, only one in 10 car seat inspections performed at those stations covered booster seat-aged children and of those, 30 percent of those children were in what the inspectors called a “sub-optimal restraint.” Booster-aged seat children are between the ages of 4 to 7 and typically sit in forward-facing child seats.

Although this study didn’t offer details about the safety restraints, other studies conducted suggest that parents allow children to move too quickly to less-restrictive booster seats, abandon booster seats altogether or to sit in the front seat.

According to recommendations by the American Academy of Pediatrics, children should sit in rear-facing seats until at least age 2, although the recommendation is based more on size than age. A booster seat should be used until a child is 57-inches tall, the average height of an 11-year-old. Children should not sit in the front seat until they are 13 years old, regardless of their size, said the American Academy of Pediatrics.

NY Times

This article originally appeared at AutoGuide.com