Researchers found that children and teens who played violent video games had increased odds of having self-, parent-, or teacher-reported aggressive behaviors over time, compared with those who didn't play such video games. The findings were reported in the Proceedings of the National Academy of Science and were based on a review of 24 studies from the US, Canada, Germany and Japan involving more than 17,000 young people. The controversial findings are the latest entry into a long-standing debate over the real-world impact of video game violence. Over the years, some studies have found a connection between the games and kids' aggression, while others have not.