This paper describes a procedure of using the average deviation from the child's mean scaled score on the ITPA to determine significant developmental discrepancies in preschool children. By using this deviation score we found approximately twice as many developmental disabilities in Head Start children as were found in an average population of preschool children.
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References
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Paraskevopoulos, J., and Kirk, S. A.: The Development and Psychometric Characteristics of the Revised Illinois Test of Psycholinguistic Abilities. Urbana, Ill.: Univ. of Ill. Press,1969.
