Performance of adults with developmental handicaps on alternate forms of the Peabody Picture Vocabulary Test.
A total of 154 adults with developmental handicaps involved in a comprehensive community-based habilitation program were tested on alternate forms of the PPVT and PPVT--Revised to determine interest reliabilities. A comparison of response profiles indicated that there was a significant degree of correspondence in general performance using alternate forms (p less than .0001). This correspondence was maintained regardless of whether overall raw score or mental age equivalents were used. However, a comparison of performance on individual test items that were identical on alternate forms showed less consistent results. Particular aspects of the administration and structure of the PPVT/PPVT-R and response characteristics of individuals with developmental handicaps are suggested as being important factors in test administration and interpretation with this population.
D000293:Adolescent; D000328:Adult; D000367:Age Factors; D006801:Humans; D007805:Language Development Disorders / Q000175:diagnosis*; D007807:Language Tests / Q000592:standards*; D008875:Middle Aged; D011594:Psychometrics; D011897:Random Allocation