According to the 2015 "International Encyclopedia of the Social & Behavioral Sciences", sex differences in aggression is one of the most robust and oldest findings in psychology. Past meta-analyses in the encyclopedia found males regardless of age engaged in more physical and verbal aggression while small effect for females engaging in more indirect aggression such as rumor spreading or gossiping. It also found males tend to engage in more unprovoked aggression at higher frequency than females. This replicated another 2007 meta-analysis of 148 studies in the journal "Child Development" which found greater male aggression in childhood and adolescence. This analysis also conforms with the "Oxford Handbook of Evolutionary Psychology" which reviewed past analysis and found greater male use in verbal and physical aggression with the difference being greater in the physical type. A meta-analysis of 122 studies published in the journal of "Aggressive Behavior" found males are more likely to cyberbully than females, although the difference was small. Difference also showed that females reported more cyberbullying behavior during mid-adolescence while males showed more cyberbullying behavior at late adolescence.