Electronic Thesis and Dissertation Repository


Master of Science


Health and Rehabilitation Sciences


Dr. Sherrilene Classen


The valid and reliable Fitness-to-Drive Screening Measure© (FTDS) is a free online proxy measure that screens for at-risk older drivers using 54 driving-related items. This secondary data analysis aims to construct and validate a short form FTDS, using 200 caregiver FTDS response sets and 200 older driver on-road assessment pass/fail outcomes. To construct the short form, exploratory factor analysis and classical test theory techniques were employed to determine the most interpretable factor model and the minimum number of items that might be used to predict fitness to drive. Next, receiver operating characteristics curves were generated to evaluate the concurrent criterion validity of the constructed short form against driver on-road pass/fail outcomes. This study resulted in the construction of FTDS short form version 1 and 2. Both short forms were predictive of on-road pass/fail outcomes. This measure may provide proxy raters with efficient means to help identify at-risk older drivers.