“…Aggression was defined as “behavior aimed at harming or injuring another person or persons” (Parke & Slaby, 1983). Dozens of studies have reported PPC’s relation with different types of aggression: physical (Blossom, Fite, Frazer, Cooley, & Evans, 2016; Casas et al, 2006; Cui, Morris, Criss, Houltberg, & Silk, 2014; Gaertner et al, 2010; Murray, Dwyer, Rubin, Knighton-Wisor, & Booth-LaForce, 2014; Nelson, Hart, Yang, Olsen, & Jin, 2006; Rathert, Fite, & Gaertner, 2011; Stevens & Hardy, 2013), verbal (Hart, Nelson, Robinson, Olsen, & McNeilly-Choque, 1998; Kuppens, Grietens, Onghena, & Michiels, 2009; Leadbeater, Banister, Ellis, & Yeung, 2008; Little & Seay, 2014; Loukas, Paulos, & Robinson, 2005; Murray, Haynie, Howard, Cheng, & Simons-Morton, 2010; Yu & Gamble, 2008), relational (see meta-analysis by Kuppens, Laurent, Heyvaert, & Onghena, 2013), peer victimization (Li, Zhang, & Wang, 2015), cyberbullying (Fousiani, Dimitropoulou, Michaelides, & Van Petegem, 2016), and self-directed aggression (McCormick, Turner, & Foster, 2015). The studies mentioned above were conducted in several different countries and used samples from childhood to emerging adulthood; therefore, PPC’s association with aggression does not seem to be limited to certain countries/cultures or age-groups.…”