Analyses were first conducted to determine whether participants who did not complete all three assessments differed from those who completed the baseline and two follow-up assessments. Univariate ANOVAs were conducted for continuous outcomes with attrition as a between-subjects factor. Chi-square analyses were performed for dichotomous outcomes. These analyses revealed that participants who completed the Time 1 but not both follow-up assessments were more likely to be female, χ2(1)=6.85, p<0.01, but did not differ in grade level, race/ethnicity, being from a single parent household, or on Time 1 aggression, levels of peer victimization or exposure to stressful life events, emotional awareness, dysregulated sadness, dysregulated anger, or rumination (all p-values>0.10).
