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The study does not include data on deaths, but Henretig said there were very few. It also lacked information on the types of car trips involved; for example, driving in busy city traffic might increase chances for crashes with injuries.

Schofer, the Northwestern professor, said other unstudied circumstances could have played a role. For example, grandparents could be less distracted and less frazzled than busy parents dropping their kids off at school while rushing to get to work or to do errands. Driving trips might be “quality time” for older drivers and their grandchildren, Schofer said.

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Online:

Pediatrics: http://www.pediatrics.org

American Academy of Pediatrics car seat recommendations: http://bit.ly/rqmKhT