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Reliability of the WAIS-Ill Subtests, Indexes, and IQs in Individuals with Substance Abuse Disorders

Joseph J. Ryan

Central Missouri State University

Julie D. Arb

Christine A. Paul

Dwight D. Eisenhower Veterans Affairs Medical Center Leavenworth, Kansas

David S. Kreiner

Central Missouri State University

Reliability of the WAIS-III for 100 male patients with substance abuse disorders was determined. Means for age and education were 46.06 years (SD = 8.81 years) and 12.70 years (SD = 1.51 years). There were 63 Caucasians and 37 African Americans. Split-half coefficients for the 11 subtests (Digit Symbol-Coding, Symbol Search, and Object Assembly were omitted) ranged from .92 for Vocabulary and Digit Span to .77 for Picture Arrangement. The median subtest reliability coefficient was .86. Composite reliabilities were excellent for the Indexes (.94 to .95) and IQs (.94 to .97), with all coefficients? .94. Using the Fisher z test to compare correlation coefficients from independent samples, none of the reliability estimates differed significantly from those reported for the WAIS-III standardization sample. Similar findings emerged when reliabilities were determined separately for Caucasian and African American participants.

Key Words: Reliability • WAIS-III • Substance Abuse Disorders • IQ • measurement

Assessment, Vol. 7, No. 2, 151-156 (2000)
DOI: 10.1177/107319110000700206
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