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But the data did show a link between playing mature-rated games and aggressive behavior. The researchers found that 51 percent of boys who played M-rated games — the industry's equivalent of an R-rated movie, meaning suitable for ages 17 and up — had been in a fight in the past year, compared to 28 percent of non-M-rated gamers.

The pattern was even stronger among girls, with 40 percent of those who played M-rated games having been in a fight in the past year, compared to just 14 percent for non-M players.

Kutner and Olson said further study is needed because the data shows only a correlation, not causation. It is unclear whether the games trigger aggression or if aggressive children are drawn to more violent games.

"It's still a minority of kids who play violent video games a lot and get into fights. If you want a good description of 13-year-old kids who play violent video games, it's your local soccer team," Olson said.