An update on the effects of playing violent video games

This article strongly supports its argument with plenty of stats. What I don't see in the article is any reference to any other type of study other then based predominately age comparisons. I would like to see a study include lifestyle before and after continued playing of any video game, and how that video game affected future behavior, good or bad. Yes, there are enough studies to support that violent games do promote aggressive behavior but there are other circumstances to encourage this also. There is no mention of lifestyle, i.e., family life, socio-economic level, etc. I strongly feel these variables play a deciding factor in what behavior a child feels is acceptable.