Paik, H., & Comstock, G. (1994). The effects of television violence on antisocial behavior: A meta-analysis. Communication Research, 21 (4), 516-546.

Abstract:  Performed a meta-analysis on studies pertaining to the effect of TV violence on aggressive behavior. Partitioning by research design, viewer attributes, treatment and exposure variables, and type of antisocial behavior allowed researchers to interpret computed effect sizes for each of the variables in the partitions. Results showed positive and significant correlation between TV violence and aggressive behavior, albeit to varying degrees depending on the particular research question. Erotica emerged as a strong factor even when not accompanied by portrayal of violence. Additionally, the effect of TV violence on the antisocial behavior of boys and girls was marginally equal in surveys. (PsycINFO Database Record (c) 2004 APA, all rights reserved)