Performance Analysis of Driving Ability (P-Drive): Investigating Construct Validity and Concordance of Australasian Data.

The pass/fail decision was made by occupational therapists using overall clinical judgment, and the authors say it is unclear how much P-Drive contributed to those decisions. Only one assessor rated each on-road performance, so the study did not test agreement between independent raters. Test-retest reliability was not examined. Two P-Drive items, Steering and Using pedals, did not fit the model as well as the other items. Participants with psychiatric illness, aphasia, developmental delay, or physical deficits alone under 65 were excluded, so the findings do not cover all drivers. Routes and road conditions varied across cities, which may affect score comparisons. The P-Drive author and a training company connected to the first author were involved, which may influence interpretation.

The third author is the P-Drive author. The first author's company conducts online P-Drive training in conjunction with the third author. P-Drive is not sold, but training courses are offered. The authors received no financial support for the research.

Do not treat the 85 cut-off or the 88% agreement figures as proof that P-Drive alone determines fitness to drive. The study compared P-Drive scores with occupational therapists' overall pass/fail judgments, and the authors state that the contribution of P-Drive to those decisions is unclear.