Stability of the WISC-IV in a sample of elementary and middle school children.
This study investigated test-retest stability of the Wechsler Intelligence Scale for Children, Fourth Edition, in 43 elementary/middle school students tested on two occasions approximately 11 months apart. Subtest stability coefficients ranged from .26 (Picture Concepts) to .84 (Vocabulary [VC]). Composite stabilities ranged from .54 (Processing Speed Index) to .88 (Full Scale Intelligence Quotient [FSIQ]). On 11 subtests and three indexes, the standardization sample stability coefficients were significantly larger than those of the present sample, with only the VC subtest and FSIQ having high levels of test-retest stability. Mean practice effects were not significant, but range of gain or loss for some individuals was large. On the FSIQ, 42% changed > +/-5 points on retest. The FSIQ is less stable than one might infer from the large stability coefficient and small mean practice effect.
Ryan
Joseph J
JJ
Department of Psychology, University of Central Missouri, Warrensburg, Missouri 64093, USA. ryan@ucmo.edu
Glass
Laura A
LA
Bartels
Jared M
JM
D002648:Child; D005260:Female; D006801:Humans; D007361:Intelligence Tests / Q000592:standards*; D008297:Male; D012016:Reference Values; D015203:Reproducibility of Results; D012574:Schools; D011795:Surveys and Questionnaires; D013997:Time Factors; D014825:Vocabulary