“…Similarly, an analysis of a clinical sample found no sex differences in therapist-reported physical aggression when considering the entire sample (11.4% boys, 14.6% girls, non-significant), but there were more boys than girls in the group of physically aggressive youth (Nock and Kazdin 2002). Generally speaking, survey-based studies tend to find equivalent rates of perpetration across sexes (Agnew and Hugeley, 1989;Browne and Hamilton 1998;Ibabe and Bentler 2016;McCloskey and Lichter 2003;Nock and Kazdin 2002;Straus et al 1980), while criminal justice data show higher rates of perpetration among adolescent boys (63-83%, Condry and Miles 2014;Pagani et al 2004;Routt and Anderson 2011;Walsh and Krienert 2009). Thus, the reporter (i.e., adolescent versus parent) and the data source (i.e., survey versus court system) may be important considerations when interpreting sex differences.…”