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  • Title: Observation of early childhood physical aggression: a psychometric study of the system for coding early physical aggression.
    Author: Mesman J, Alink LR, van Zeijl J, Stolk MN, Bakermans-Kranenburg MJ, van Ijzendoorn MH, Juffer F, Koot HM.
    Journal: Aggress Behav; 2008; 34(5):539-52. PubMed ID: 18498138.
    Abstract:
    We investigated the reliability and (convergent and discriminant) validity of an observational measure of physical aggression in toddlers and preschoolers, originally developed by Keenan and Shaw [1994]. The observation instrument is based on a developmental definition of aggression. Physical aggression was observed twice in a laboratory setting, the first time when children were 1-3 years old, and again 1 year later. Observed physical aggression was significantly related to concurrent mother-rated physical aggression for 2- to 4-year-olds, but not to maternal ratings of nonaggressive externalizing problems, indicating the measure's discriminant validity. However, we did not find significant 1-year stability of observed physical aggression in any of the age groups, whereas mother-rated physical aggression was significantly stable for all ages. The observational measure shows promise, but may have assessed state rather than trait aggression in our study.
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