A study published in Pediatrics, the journal published by the American Association of Pediatrics suggests that the Motion Picture Association is not sensitive enough to increasing violence adolescents are exposed to in movies.

The study states that violence in movies has increased steadily over time, especially in movies rated PG-13; the researchers wanted to establish whether or not main characters who exhibited violent behavior were also shown to be engaged in other potentially risky behavior, such as alcohol, sex and tobacco related scenes.

The research team analyzed top grossing movies from 1995-2010; 90% of the main characters were involved a violent act; 77% of those characters were engaged in other risky behaviors.

This isn’t the first time the MPA has been taken to task for not being sensitive to violent content adolescents are exposed to. As early as 2002, a Dartmouth study expressed the same disappointment at the cavalier attitude the Motion Picture Association seems to have with regards to violence in movies.

Last month, Pediatrics published a study asserting that on average, gun violence occurs twice an hour in the most popular films; additionally, the researchers discovered that gun violence in PG-13 movies now exceeds violence in R rated movies.