title: Internal consistency and concurrent validity of two short forms of the Visual Form Discrimination Test.
abstract: The purpose of this study was to evaluate the reliability and concurrent validity of 2 short forms of the Visual Form Discrimination Test, referred to as first half (FH) and front-back (FB). Participants were a mixed sample of 225 patients seen for neuropsychological evaluations. The mean difference score between both short forms and the full form was less than 1 point. The short-total correlations were .85 and .86 for the FH and FB forms, respectively. A binary clinical decision rule, used to classify patients as normal or impaired, resulted in a 93.3% correct and a 94.7% correct classification rate for the FH and FB forms, respectively. It is concluded that the short form of the test, used in conjunction with a clinical decision rule, results in a very minor loss of accuracy.
authors.affiliation: Department of Psychiatry, University of British Columbia, Vancouver, Canada.
authors.forename: G L
authors.initials: GL
authors.lastname: Iverson
authors.forename: T S
authors.initials: TS
authors.lastname: Woodward
authors.forename: L
authors.initials: L
authors.lastname: Smith-Seemiller
mesh_terms: D000328:Adult; D000368:Aged; D003704:Dementia / Q000175:diagnosis / Q000523:psychology*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009483:Neuropsychological Tests / Q000592:standards; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D014796:Visual Perception