Factors related to driving difficulty and habits in older drivers.
OBJECTIVE
To evaluate the association between chronic medical conditions, functional, cognitive, and visual impairments and driving difficulty and habits among older drivers.


METHODS
Cross-sectional study.


METHODS
Mobile County, Alabama.


METHODS
A total of 901 residents of Mobile County, Alabama aged 65 or older who possessed a driver's license in 1996.


METHODS
Information on demographic characteristics, functional limitations, chronic medical conditions, driving habits, and visual and cognitive function were collected via telephone. The three dependent variables in this study were difficulty with driving, defined as any reported difficulty in > or = 3 driving situations (e.g. at night), low annual estimated mileage, defined as driving less than 3000 miles in 1996, and low number of days ( < or = 3) driven per week.


RESULTS
A history of falls, kidney disease or stroke was associated with difficulty driving. Older drivers with a history of kidney disease were more likely to report a low annual mileage than subjects without kidney disease. Low annual mileage was also associated with cognitive impairment. In general, older drivers with a functional impairment were more likely to drive less than 4 days per week. Older drivers with a history of cataracts or high blood pressure were more likely to report a low number of days driven per week, while subjects with visual impairment were at increased risk of experiencing difficulty driving as well as low number of days driven per week.


CONCLUSIONS
The results underscore the need to further understand the factors negatively affecting driving independence and mobility in older drivers, as well as the importance of improved communication between older adults and health care professionals regarding driving.
Lyman
J M
JM
Department of Epidemiology, School of Public Health, University of Alabama at Birmingham, USA.
McGwin
G
G
Sims
R V
RV
D000063:Accidents, Traffic / Q000517:prevention & control*; D000203:Activities of Daily Living; D000368:Aged; D000369:Aged, 80 and over; D000407:Alabama / Q000453:epidemiology; D001334:Automobile Driving; D016022:Case-Control Studies; D002908:Chronic Disease / Q000453:epidemiology; D003071:Cognition; D003430:Cross-Sectional Studies; D005260:Female; D006304:Health Status; D006801:Humans; D008297:Male; D016017:Odds Ratio; D012306:Risk; D014792:Visual Acuity