Utility of WAIS-R short forms in schizophrenia

Development of brief versions of the Wechsler Intelligence Scale for schizophrenia: Considerations of the structure and predictability of intelligence

“…Several studies using schizophrenia samples (Allen et al, 1997;Iverson et al, 1998;Missar et al, 1994;Ryan et al, 1999;Uetsuki et al, 2004) have routinely applied the SFs produced mostly based on the normal standardization samples, with no theoretical consideration for the intellectual construct or functioning of this disease. The SFs carefully designed for schizophrenia will warrant an accurate estimation for the intellectual status of this disease.…”

“…Apparently, subtests that are less affected by these variables would be desirable for the SFs. Allen et al (1997) administered the Kaufman's 4SF (Arithmetic, Similarities, Digit Symbol, and Picture Completion) (Kaufman et al, 1991) to patients with schizophrenia, and found a significant correlation between performance on the SF and education, but not age of onset. The study also reported negative correlations between the scores of the SF and psychiatric symptoms assessed by the Bunney-Hamburg Psychosis ratings (Bunney and Hamburg, 1963).…”

“…Nor has the study addressed which psychotic symptoms (e.g. positive or negative) disturbed the execution of the subtests included in the SF (Allen et al, 1997).…”

Estimation of the Intelligence Quotient Using Wechsler Intelligence Scales in Children and Adolescents with Asperger Syndrome

“…Short forms of Wechsler full test batteries have been developed by either selecting items from subtests or by selecting specific subtests. The selection of certain subtests has numerous advantages (provides estimated IQ scores with substantial time savings, in some cases 85-90%, for patients who exhibit impaired attention and/or deficient motivation) over short forms based on item reduction (Allen et al 1997). Different combinations of subtests have been examined as clinical screening methods for estimating FSIQ (Kaufman et al 1991;Reynolds et al 1983;Silverstein 1982;Ward 1990).…”

“…Several authors have studied the application of the short versions of the Wechsler Scales in healthy adults and adolescents (Hunter et al 1989;Lange and Iverson 2008), children with behavioral problems (Finch et al 1979;Haynes 1982Haynes , 1983, patients with traumatic brain injury (Donders 1992;Shoop et al 2001) or schizophrenia (Allen et al 1997;Blyler et al 2000;Missar et al 1994), and people with elderly dementia (Brooks and Weaver 2005;Donnell et al 2007). The results of these studies suggest that short forms have universally shown to misclassify IQ; the longer short forms (four, five, or seven subtests) have better correlations and classification rates than dyads, and practitioners should only select those if time is really a priority.…”