Journal
AGGRESSIVE BEHAVIOR
Volume 35, Issue 5, Pages 357-375Publisher
WILEY
DOI: 10.1002/ab.20313
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Funding
- NIMH [R01 MH63076, K02 MH073616]
- NATIONAL INSTITUTE OF MENTAL HEALTH [K02MH073616, R01MH063076] Funding Source: NIH RePORTER
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For a sample followed from age 9-13 (N = 281), this investigation examined developmental trajectories for social and physical aggression as measured by teacher ratings. Trajectories for both forms of aggression were estimated first separately, then jointly. Mean levels of both social and physical aggression decreased over time for the overall sample, but with high variability of individual trajectories. Subgroups followed high trajectories for both social and physical aggression. Joint estimation yielded six trajectories: low stable, low increasers, medium increasers, medium desisters, high desisters, and high increasers. Membership in the high increaser group was predicted by male gender, unmarried parents, African American ethnicity, and maternal authoritarian and permissive parenting. Permissive parenting also predicted membership in the medium increaser group. This is one of the first studies to examine social aggression longitudinally across this developmental period. Though the results challenge the claim that social aggression is at its peak in early adolescence, the findings emphasize the importance of considering different developmental trajectories in trying to understand origins and outcomes of aggression. Aggr. Behav. 35:357-375, 2009. (C) 2009 Wiley-Liss. Inc.
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