Drivers' psychiatric disorders and fatal motor vehicle accidents in Finland.

Relatively little is known about fatal motor vehicle accidents (FMVA) involving drivers with psychiatric disorders. In this study of all drivers killed in FMVAs in Finland between 1990 and 2011, we aimed to study drivers' death rate trends in FMVAs, with special focus on drivers with a history of psychiatric disorders. Prevalence of drivers' hospital treated psychiatric disorders, and characteristics of drivers with psychiatric disorders were also studied. For the purpose of this study, three national registers were accessed. Drivers' hospital treated psychiatric disorders were screened in a five-year period prior to death. Drivers with (n = 425) and without (n = 3856) psychiatric disorders were compared, female and male drivers separately. The main outcome measure was any psychiatric disorder in drivers within the five-year timescale. Socio-demographic factors, use of intoxicants and medication at the time of death, recent adverse life events, and drivers' physical and emotional states were used as covariates in the statistical analyses. During the study period, death rates increased for females with psychiatric disorders, and decreased for females without psychiatric disorders. Death rates for males with psychiatric disorders decreased between the years 1990-2000 and 2007-2011, and increased between the years 2000-2007. Death rates decreased over the whole study period in males without psychiatric disorders. Alcohol related disorders and affective disorders were the most prevalent hospital treated psychiatric disorders among drivers involved in FMVAs. Use of medications at the time of death, and committing suicide in traffic both associated with being a driver with psychiatric disorders involved in FMVAs for both genders. As FMVAs involving drivers with psychiatric disorders have increased, a more focused and detailed evaluation of the driving performance of drivers with psychiatric disorders is recommended. These evaluations should also be extended to drivers with non-psychotic disorders.