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The reliability and concurrent validity of the Test of Motor Impairment-Henderson Revision was evaluated employing a sample of preschoolers. Absolute reliability of the final test score was established by calculating the standard error of measurement (SEM). An SEM of .86 was obtained. The consistency of decisions related to motor impairment or nonimpairment was estimated by calculating the proportion of agreement index across two testing occasions and Kappa. A 90% agreement was obtained with Kappa equal to .71. Concurrent validity using the Bruininks-Oseretsky Test of Motor Proficiency-Short Form as the criterion resulted in an 88% agreement between the two tests.
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