Effect of anemia and comorbidity on functional status and mortality in old age: results from the Leiden 85-plus Study.
BACKGROUND
There is limited insight into the attributable effect of anemia and comorbidity on functional status and mortality in old age.


METHODS
The Leiden 85-plus Study is a population-based prospective follow-up study of 562 people aged 85 years. Anemia was defined according to World Health Organization criteria. We measured 3 parameters of functional status at baseline and annually thereafter for 5 years: disability in basic and instrumental activities of daily living, cognitive function and the presence of depressive symptoms. We obtained mortality data from the municipal registry.


RESULTS
The prevalence of anemia at baseline was 26.7% (150/562). Participants who had anemia at baseline had more disability in activities of daily living, worse cognitive function and more depressive symptoms than participants without anemia at baseline (p <or= 0.01). These differences disappeared after adjustment for comorbidity. After adjustment for comorbidity in the prospective analyses, anemia at baseline was associated with an additional increase in disability in instrumental activities of daily living during follow-up; incident anemia during follow-up (n = 99) was associated with an additional increase in disability in basic activities of daily living. Prevalent and incident anemia were both associated with an increased risk of death, even after we adjusted for sex, education level, income, residence in a long-term care facility, C-reactive protein level, creatinine clearance and the presence of disease (hazard ratio for prevalent anemia 1.41, 95% confidence interval [CI] 1.13 to 1.76; hazard ratio for incident anemia 2.08, 95% CI 1.60 to 2.70).


CONCLUSIONS
Anemia in very elderly people appears to be associated with an increased risk of death, independent of comorbidity. However, the associated functional decline appears to be attributed mainly to comorbidity.
den Elzen
Wendy P J
WP
Department of Public Health and Primary Care, Leiden University Medical Center, Leiden, the Netherlands. w.p.j.den_elzen@lumc.nl
Willems
Jorien M
JM
Westendorp
Rudi G J
RG
de Craen
Anton J M
AJ
Assendelft
Willem J J
WJ
Gussekloo
Jacobijn
J
D000203:Activities of Daily Living; D000369:Aged, 80 and over; D000740:Anemia / Q000175:diagnosis / Q000453:epidemiology*; D003072:Cognition Disorders / Q000453:epidemiology*; D015897:Comorbidity; D003430:Cross-Sectional Studies; D003863:Depression / Q000453:epidemiology*; D004185:Disability Evaluation; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D015994:Incidence; D008297:Male; D009426:Netherlands / Q000453:epidemiology; D015995:Prevalence; D011446:Prospective Studies; D018570:Risk Assessment; D012307:Risk Factors; D016019:Survival Analysis