Evaluating Drivers Licensed with Medical Conditions in Utah, 1992-1996

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Evaluating Drivers Licensed with Medical Conditions in Utah, 1992-1996

E. Diller / L. Cook / D. Leonard / J. Reading / J. M. Dean

The Utah License Division has implemented a program since 1979 that restricts drivers with medical conditions by functional ability category (medical condition) according to their functional ability level. This study compares the citation, all crash, and at-fault crash rate per eligible licensed days of restricted and unrestricted drivers with medical conditions by category to the rates of comparison drivers matched on age group, gender and county of residence over a five year period. Analyses were performed separately for drivers reporting single medical conditions and those reporting multiple medical conditions. Probabilistic linkage was used to link data from different databases in order to determine the crash, at fault crash and citation rates by functional ability restriction classification at the time of occurrence. Corresponding relative risks and confidence intervals were calculated.