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Survival in patients with incident dementia compared with a control group: a five-year follow-up

Published online by Cambridge University Press:  30 March 2012

Daniela Koller*
Affiliation:
Division Health Economics, Health Policy and Outcomes Research, Centre for Social Policy Research, University of Bremen, Bremen, Germany
Hanna Kaduszkiewicz
Affiliation:
Institute of Primary Medical Care, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
Hendrik van den Bussche
Affiliation:
Institute of Primary Medical Care, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
Marion Eisele
Affiliation:
Institute of Primary Medical Care, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
Birgitt Wiese
Affiliation:
Centre for Biometry, Medical Informatics and Medical Technology, Institute for Biometry, Hannover Medical School, Hannover, Germany
Gerd Glaeske
Affiliation:
Division Health Economics, Health Policy and Outcomes Research, Centre for Social Policy Research, University of Bremen, Bremen, Germany
Falk Hoffmann
Affiliation:
Division Health Economics, Health Policy and Outcomes Research, Centre for Social Policy Research, University of Bremen, Bremen, Germany
*
Correspondence should be addressed to: Daniela Koller, University of Bremen, ZeS Mary-Somervile-Str. 5, 28359 Bremen, Germany. Phone: +49-421-218-58514; Fax: +49-421-218-58617. Email: dkoller@zes.uni-bremen.de.

Abstract

Background: Dementia is an important disease in older age. Existing studies on dementia mortality face limitations. For instance, they are based on prevalent, small, or geographically limited samples or do not include controls. We aimed to study survival after the first diagnosis of dementia compared with a control group.

Methods: We analyzed claims data of a German health insurance company, including 1,818 incident dementia cases and 7,235 age- and sex-matched non-dementia controls (53% male; mean age 78.8 years). The follow-up was five years. We assessed survival with the Kaplan–Meier curves and performed Cox proportional hazard regression, also including nursing care dependency and comorbidities.

Results: The cumulative five-year mortality was 53.5% in the dementia cases and 31.1% in the control group (hazard ratio: 2.1). Even after adjusting for comorbidities and nursing care, the mortality risk was 1.5 times higher for patients with incident dementia than for controls. Nursing care dependency showed high influence on mortality, likewise in dementia patients and controls.

Conclusions: Although some factors, such as education or the type and severity of dementia, could not be included in the analyses, our study shows a clear influence of dementia on mortality irrespective of age, sex, care dependency, and comorbidities. The strongest influence on mortality was found for dementia patients with nursing care dependency. Taking into account their mortality of around 70% in care level 1 and up to 80% in care levels 2 and 3, healthcare delivery to these patient groups should strongly consider elements of palliative care focusing on the quality of life.

Type
Research Article
Copyright
Copyright © International Psychogeriatric Association 2012

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