title: Accuracy of Short Forms of the Dutch Wechsler Preschool and Primary Scale of Intelligence: Third Edition.
abstract: This article investigated the accuracy of six short forms of the Dutch Wechsler Preschool and Primary Scale of Intelligence-Third edition (WPPSI-III-NL) in estimating intelligent quotient (IQ) scores in healthy children aged 4 to 7 years (N = 1,037). Overall, accuracy for each short form was studied, comparing IQ equivalences based on the short forms with the original WPPSI-III-NL Full Scale IQ (FSIQ) scores. Next, our sample was divided into three groups: children performing below average, average, or above average, based on the WPPSI-III-NL FSIQ estimates of the original long form, to study the accuracy of WPPSI-III-NL short forms at the tails of the FSIQ distribution. While studying the entire sample, all IQ estimates of the WPPSI-III-NL short forms correlated highly with the FSIQ estimates of the original long form (all rs ≥ .83). Correlations decreased significantly while studying only the tails of the IQ distribution (rs varied between .55 and .83). Furthermore, IQ estimates of the short forms deviated significantly from the FSIQ score of the original long form, when the IQ estimates were based on short forms containing only two subtests. In contrast, unlike the short forms that contained two to four subtests, the Wechsler Abbreviated Scale of Intelligence short form (containing the subtests Vocabulary, Similarities, Block Design, and Matrix Reasoning) and the General Ability Index short form (containing the subtests Vocabulary, Similarities, Comprehension, Block Design, Matrix Reasoning, and Picture Concepts) produced less variations when compared with the original FSIQ score.
authors: Maastricht University, Maastricht, Netherlands pm.hurks@maastrichtuniversity.nl.
authors: Petra
authors: P
authors: Hurks
authors: Kempenhaeghe Center for Neurological Learning Disabilities, Heeze, Netherlands University Hospital Maastricht, Maastricht, Netherlands.
authors: Jos
authors: J
authors: Hendriksen
authors: Pearson Test Publishers, Amsterdam, Netherlands.
authors: Joelle
authors: J
authors: Dek
authors: Pearson Test Publishers, Amsterdam, Netherlands.
authors: Andress
authors: A
authors: Kooij
mesh_terms: D002648:Child; D002675:Child, Preschool; D005260:Female; D006801:Humans; D007360:Intelligence; D008297:Male; D009426:Netherlands; D011594:Psychometrics / Q000706:statistics & numerical data*; D012016:Reference Values; D015203:Reproducibility of Results; D013223:Statistics as Topic; D014888:Wechsler Scales / Q000706:statistics & numerical data*
keywords: intelligence; short forms; young children