Principal-components analysis of the equivalence of alternate forms of the Trail Making Test.

One of the methods of evaluating the reliability of alternative forms of assessment instruments is to evaluate the relation of the 2 forms to other measures in a factor analysis. Using this method, the authors investigated the reliability of alternate forms of trail Making Tests A and B, called Trails C and D. Neuropsychological screening test data were collected from the files of 144 clients referred to a university hospital for neuropsychological evaluations. The tests included Trail Making Tests A, B, C and D ; the Digit Symbol subtest of the Wechsler Adult Intelligence Scale-Revised ; and the Stroop Color-Word test. Analyses provided tentative support for the equivalency of the alternative forms of the Trail Making Test