Between the different informants, correlations of the total aggression ratings ranged from low to moderate (r range 0.13–0.33), with the highest correlations being between the teacher ratings at age 12 and 14 (r = 0.31) and the age 14 self and co-twin ratings (r = 0.33) (Table 2). Additionally, correlations between the direct and indirect aggression subscales of each informant were moderate (teacher at age 12 r = 0.62, all others ranged 0.34–0.52).Table 2Pearson correlations between different informants’ total aggression scoresInformant (age of participant)Parent (12)Teacher (12)Teacher (14)Self (14)Co-Twin (14)Parent (12)–Teacher (12)0.26–Teacher (14)0.150.36–Self (14)0.130.180.18–Co-Twin (14)0.270.220.210.33–All correlations, p < 0.001N range for correlations, 918–1270
