Background
Personality traits have been associated with physician-rated illness burden cross-sectionally, but longitudinal associations between personality and objective medical morbidity remain unclear.
Purpose
To examine associations between personality and physician-rated illness burden 4 years prospectively in older primary care patients.
Method
At baseline, patients (average age = 75, SD = 6.6, 62% female) completed the NEO-Five Factor Inventory. At baseline and 4 yearly follow-ups, a physician completed the Cumulative Illness Rating Scale based on medical records.
Results
Linear mixed effects models revealed that higher neuroticism and lower conscientiousness predicted worse average illness burden longitudinally. Relatively disagreeable persons (25th percentile) accumulated morbidity at a 33% faster rate than agreeable (75th percentile) peers. At the final follow-up, a person at the 75th percentile of neuroticism and the 25th percentile of conscientiousness and agreeableness showed morbidity comparable to a peer of average personality but 10 years older. An individual at the 25th percentile of neuroticism and 75th percentile of conscientiousness and agreeableness showed end-point illness burden comparable to a peer of average personality but 10 years younger. 21% of the morbidity associated with neuroticism was explained by total cholesterol. History of hypertension, smoking, alcohol/drug abuse, and affective symptoms of depression each explained 10% or less of the other observed personality effects.
Conclusion
Personality plays a non-trivial role in healthy aging among older persons. Brief personality assessment may identify at-risk older persons for closer monitoring, enhance the accuracy of medical prognosis, and provide clues for clinical interventions to promote better health.