Abstract
Teachers rated 1337 school children to determine norms for a hyperactivity rating scale; teacher ratings of 45 hyperactive children, referred by physicians, were also obtained. Although hyperative and norm means were clearly separated, a nontrivial portion of hyperactive children had teacher ratings within the normal range. Norm data were factor-analyzed, and a hyperactivity factor was identified. Behaviors with the highest loadings on the hyperactivity factor yielded the largest differences between hyperactive and norm groups. Within the norm group, black children had the highest hyperactive ratings and oriental children had the lowest. Hyperactivity ratings were slightly higher for boys than for girls.
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