Preliminary evidence for subdimensions of geriatric frailty: the MacArthur study of successful aging.
OBJECTIVE
To identify frailty subdimensions.


METHODS
Longitudinal cohort (MacArthur Study).


METHODS
Three U.S. urban centers.


METHODS
One thousand one hundred eighteen high-functioning subjects aged 70 to 79 in 1988.


METHODS
Participants with three or more of five Cardiovascular Health Study (CHS) frailty criteria (weight loss, weak grip, exhaustion, slow gait, and low physical activity) in 1991 were classified as having the CHS frailty phenotype. To identify frailty subdimensions, factor analysis was conducted using the CHS variables and an expanded set including the CHS variables, cognitive impairment, interleukin-6 (IL-6), C-reactive protein (CRP), subjective weakness, and anorexia. Participants with four or more of 10 criteria were classified as having an expanded frailty phenotype. Predictive validity of each identified frailty subdimension was assessed using regression models for 4-year disability and 9-year mortality.


RESULTS
Two subdimensions of the CHS phenotype and four subdimensions of the expanded frailty phenotype were identified. Cognitive function was consistently part of a subdimension including slower gait, weaker grip, and lower physical activity. The CHS subdimension of slower gait, weaker grip, and lower physical activity predicted disability (adjusted odds ratio (AOR)=1.7, 95% confidence interval (CI)=1.3-2.2) and mortality (AOR=1.5, 95% CI=1.3-1.8). Subdimensions of the expanded model with predictive validity were higher IL-6 and CRP (AOR=1.2 for mortality); slower gait, weaker grip, lower physical activity, and lower cognitive function (AOR=1.8 for disability; AOR=1.5 for mortality), and anorexia and weight loss (AOR=1.2 for disability).


CONCLUSIONS
This study provides preliminary empirical support for subdimensions of geriatric frailty, suggesting that pathways to frailty differ and that subdimension-adapted care might enhance care of frail seniors.
Sarkisian
Catherine A
CA
Veterans Affairs Greater Los Angeles Healthcare System Geriatric Research, Education, and Clinical Center, Los Angeles, California 90073, USA. csarkisian@mednet.ucla.edu
Gruenewald
Tara L
TL
John Boscardin
W
W
Seeman
Teresa E
TE
D000368:Aged; D005260:Female; D016330:Frail Elderly; D015577:Geriatric Assessment / Q000379:methods*; D006801:Humans; D008137:Longitudinal Studies; D008297:Male