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From the Rush Alzheimer’s Disease Center (RSW, KRK) and the Rush Institute for Healthy Aging (LG, JLB, CFMdL, DAE), and the Departments of Neurological Sciences (RSW, DAE), Psychology (RSW, KRK), and Internal Medicine (JLB, CFMdL, DAE), Rush University Medical Center, Chicago, Illinois.
Address correspondence and reprint requests to Robert S. Wilson, PhD, Rush Alzheimer’s Disease Center, Rush University Medical Center, 600 S. Paulina, Suite 1038, Chicago, IL 60612. E-mail: rwilson{at}rush.edu
Objective: The objective of this study was to test the association of the personality traits of neuroticism and extraversion with risk of death in old age.
Methods: A census was taken of a geographically defined urban community in Chicago, and those aged 65 years or older were invited to participate in an in-home interview; 6158 (79% of those eligible) did so. The interview included brief measures of neuroticism and extraversion, medical history, and questions about current participation in cognitive, social, and physical activities. Vital status was subsequently monitored. The association of each trait with risk of death was examined in a series of accelerated failure-time models that controlled for age, sex, race, and education.
Results: During a mean of more than 6 years of observation, 2430 persons (39.5%) died. A high level of neuroticism (score = 27; 90th percentile) was associated with a 33% increase in risk of death compared with a low level of neuroticism (score = 9; 10th percentile). A high level of extraversion (score = 33; 90th percentile) was associated with a 21% decrease in risk of death compared with a low level (score = 18; 10th percentile). Adjustment for medical conditions and health-related variables did not substantially affect results, but adjusting for baseline levels of cognitive, social, and physical activity reduced the association of both traits with mortality.
Conclusions: The results suggest that higher extraversion and lower neuroticism are associated with reduced risk of mortality in old age and that these associations are mediated in part by personality-related patterns of cognitive, social, and physical activity.
Key Words: neuroticism • extraversion • mortality • cognitive activity • social activity • physical activity
Abbreviations: SD = standard deviation; SE = standard error; RR = relative risk; CI = confidence interval.
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