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Assessment
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Effects on WAIS-III Performance IQ (PIQ) and Full Scale IQ (FSIQ) When Object Assembly Is Substituted for Each Standard Performance Scale Subtest

Joseph J. Ryan

Central Missouri State University, ryan{at}cmsu1.cmsu.edu

Jeri Morris

Northwestern University

Kristina I. Brown

Central Missouri State University

Laura A. Glass

Central Missouri State University

According to the WAIS-III Administration and Scoring Manual, Object Assembly (OA) may be substituted for any spoiled Performance subtest. This assertion has not been evaluated in a clinical sample. The present investigation reports differences that resulted in Performance IQ (PIQ) and Full Scale IQ (FSIQ) when OA replaced each of the Performance subtests. Participants were 47 referrals for neuropsychological assessment (age M = 45.98 years, SD = 9.82; education M = 13.82 years, SD = 2.78). Results indicated that OA may replace any Performance subtest without seriously altering the summary scores. Differences between the standard IQs and OA-based composites were < 2 points for PIQ and < 1 point for FSIQ. More than 90% of the OA-based composites fell within the 90% confidence limits of the corresponding IQ.

Key Words: WAIS-III • Object Assembly • substitution • PIQ • FSIQ

Assessment, Vol. 13, No. 4, 391-395 (2006)
DOI: 10.1177/1073191106289889
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