Baade and Schoenberg (2004) propose a method to estimate the level of premorbid cognitive functioning of an individual, using their results in previous school performance tests. This estimate is crucial in neuropsychological assessments to determine if there was cognitive decline.
The authors reviewed existing literature on the relationship between Wechsler intelligence tests and group performance tests such as SAT and ACT. They propose that clinicians can use the predicted difference method to estimate IQ from performance test results. This method is commonly used to identify discrepancies between skill and performance in assessments of learning disabilities.
The authors present tables with the correlations between the Wechsler intelligence tests and the group performance tests, as well as descriptive statistics of some selected tests. They discuss the advantages and limitations of the proposed method, including the need for further research to validate the approach.
BAADE, L. E.; SCHOENBERG, M. A proposed method to estimate premorbid intelligence using group achievement measures from school records. Archives of Clinical Neuropsychology, v. 19, pp. 227-243, 2004.
