Estimating premorbid general cognitive functioning for children and adolescents using the American Wechsler Intelligence Scale for Children-Fourth Edition: demographic and current performance approaches.
Neuropsychologic evaluation requires current test performance be contrasted against a comparison standard to determine if change has occurred. An estimate of premorbid intelligence quotient (IQ) is often used as a comparison standard. The Wechsler Intelligence Scale for Children-Fourth Edition (WISC-IV) is a commonly used intelligence test. However, there is no method to estimate premorbid IQ for the WISC-IV, limiting the test's utility for neuropsychologic assessment. This study develops algorithms to estimate premorbid Full Scale IQ scores. Participants were the American WISC-IV standardization sample (N = 2172). The sample was randomly divided into 2 groups (development and validation). The development group was used to generate 12 algorithms. These algorithms were accurate predictors of WISC-IV Full Scale IQ scores in healthy children and adolescents. These algorithms hold promise as a method to predict premorbid IQ for patients with known or suspected neurologic dysfunction; however, clinical validation is required.
Schoenberg
Mike R
MR
Department of Neurology, University Hospitals Case Medical Center, Cleveland and Case Western Reserve University School of Medicine, Cleveland, Ohio 44106, USA. Michael.Schoenberg@UHhospitals.org
Lange
Rael T
RT
Brickell
Tracey A
TA
Saklofske
Donald H
DH
D000293:Adolescent; D000367:Age Factors; D016009:Chi-Square Distribution; D002648:Child; D003071:Cognition / Q000502:physiology*; D003710:Demography; D005260:Female; D006801:Humans; D007360:Intelligence / Q000502:physiology*; D008297:Male; D011237:Predictive Value of Tests; D012044:Regression Analysis; D015203:Reproducibility of Results; D014888:Wechsler Scales / Q000592:standards* / Q000706:statistics & numerical data*