Identification of dementia: agreement among national survey data, medicare claims, and death certificates.

Health Services Research
Truls OstbyeB L Plassman

Abstract

To estimate the proportion of seniors with dementia from three independent data sources and their agreement. The longitudinal Asset and Health Dynamics among the Oldest Old (AHEAD) study (n=7,974), Medicare claims, and death certificate data. Estimates of the proportion of individuals with dementia from: (1) self- or proxy-reported cognitive status measures from surveys, (2) Medicare claims, and (3) death certificates. Agreement using Cohen's kappa; multivariate logistic regression. The proportion varied substantially among the data sources. Agreement was poor (kappa: 0.14-0.46 depending upon comparison assessed); the individuals identified had relatively modest overlap. Estimates of dementia occurrence based on cognitive status measures from three independent data sources were not interchangeable. Further validation of these sources is needed. Caution should be used if policy is based on only one data source.

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Citations

Feb 8, 2011·Alzheimer Disease and Associated Disorders·M Maria GlymourJennifer J Manly
Apr 30, 2013·BMC Geriatrics·Nicole R FowlerJulie M Donohue
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