Regarding target children's T1 prosocial behavior, post hoc Gabriel tests indicated that children with low antisocial/high prosocial friends at T1 were more prosocial at T1 than any other children in the study, i.e., more prosocial than those with moderate antisocial/high prosocial friends (p < .05), moderate antisocial/low prosocial friends (p < .001), low antisocial/low prosocial friends (p < .001), and those with no nominated best friends (p < .001) at T1. No significant differences in T1 prosocial behavior emerged, however, between any other groups. The means and standard deviations of target children's T1 antisocial and prosocial behavior by child gender and nominated best friends’ behavior at T1 are shown in Table 1.