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University of Iowa News Release


Feb. 10, 2009

PHOTOS: (photo, left) A research assistant demonstrates driving-test equipment used in a University of Iowa study on Alzheimer's disease patients and driving skills:

(photo, right) A low-res photo of Jeffrey Dawson is available at

Tests may predict driving safety in people with Alzheimer's disease

Doctors may soon be able to use certain cognitive tests to help determine whether a person with Alzheimer's disease can safely get behind the wheel, thanks to research led by a University of Iowa biostatistician.

The research was published in the Feb. 10 print issue of Neurology, the medical journal of the American Academy of Neurology.

"The number of people with dementia is increasing as our population ages, and we will face a growing public health problem of elderly drivers with memory loss," said the study's author, Jeffrey Dawson, associate professor of biostatistics in the UI College of Public Health.

In the study, 40 drivers with early Alzheimer's disease and 115 elderly drivers without this diagnosis underwent a combination of off-road tests that measured thinking, movement and visual skills. The participants also drove a 35-mile route in and outside a city. Driving safety errors were recorded by a driving expert, based on a video review of the drive.

Dawson and colleagues found that drivers with Alzheimer's disease committed an average of 42 safety mistakes, or 27 percent more errors than those made by the drivers without Alzheimer's disease, who committed an average of 33 safety errors on the test drive. The most common mistakes were lane violations. For every five years older the participant was, the number of safety errors went up by about two and a half, whether or not the driver had Alzheimer's disease.

Among the study drivers with Alzheimer's disease, those who performed better on the off-road tests also made fewer on-road safety errors.

"The goal is to prevent crashes while still maximizing patients' rights and freedom to be mobile," Dawson said. "By measuring driver performance through off-road tests of memory and visual and motor abilities, we may be able to develop a standardized assessment of a person's fitness to drive."

The study was supported by a grant from the National Institute on Aging, part of the National Institutes of Health.

The study team also included researchers from the UI departments of neurology, mechanical and industrial engineering, and the UI Public Policy Center.

Note: This news release is an adaptation of a release provided by the American Academy of Neurology.

STORY SOURCE: The University of Iowa College of Public Health Office of Communications and External Relations, 4257 Westlawn, Iowa City, Iowa 52242.

MEDIA CONTACT: Hannah Fletcher, 319-384-4277,