Adaptive and maladaptive correlates of repetitive behavior and restricted interests in persons with down syndrome and developmentally-matched typical children: a two-year longitudinal sequential design.

For typically developing younger children, the T1–T2 Mean CRI ( r (23) = .53, p = .009) and Repetitive Behaviors ( r (23) = .57, p = .005) were correlated, but “Just Right” Behaviors were not (although they approached significance at p = .051).

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