Validity and reliability of the Katz-15 scale to measure unfavorable health outcomes in community-dwelling older people

OBJECTIVES: To predict the risk of future unfavourable health outcomes in older people it is common to assess the level of both basic and instrumental activities of daily living. To accomplish this, the commonly used Katz-6 and the Lawton IADL questionnaires can be combined to form the ‘Modified Kat...

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Veröffentlicht in:The Journal of nutrition, health & aging health & aging, 2014-12, Vol.18 (9), p.848-854
Hauptverfasser: Laan, Wijnand, Zuithoff, N. P. A, Drubbel, I, Bleijenberg, N, Numans, M. E, De Wit, N. J, Schuurmans, M. J
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container_end_page 854
container_issue 9
container_start_page 848
container_title The Journal of nutrition, health & aging
container_volume 18
creator Laan, Wijnand
Zuithoff, N. P. A
Drubbel, I
Bleijenberg, N
Numans, M. E
De Wit, N. J
Schuurmans, M. J
description OBJECTIVES: To predict the risk of future unfavourable health outcomes in older people it is common to assess the level of both basic and instrumental activities of daily living. To accomplish this, the commonly used Katz-6 and the Lawton IADL questionnaires can be combined to form the ‘Modified Katz ADL’ scale, also known as the Katz-15 scale. So far, the validity and reliability of the Katz-15 scale is unknown. The objective of the current study is to investigate how well the Katz-15 is able to predict future unfavorable health outcomes and how this is related to the existing Katz-6 scale. DESIGN: We performed a follow-up study using data from a group of 60 year and older participants from a large Dutch clinical trial. PARTICIPANTS: We included 2321 participants in the analysis. The average age of the study population was 74 years and 44% was male. MEASUREMENTS: We studied the relation between the Katz-15 scale and a number of unfavourable health outcomes, such as hospitalization, admission to a nursing home, admission to a home for the aged and death within one year of follow-up. RESULTS: We found the Katz-15 to be both internally consistent and strongly associated with quality of life measures. We observed moderate to strong associations between the Katz-15 and the unfavourable health outcomes All associations studied were stronger for the Katz-15 scale as compared to the Katz-6 scale. CONCLUSION: The results of our study indicate that the Katz-15 scale is able to reliably and validly predict future unfavorable health outcomes. This makes the scale a valuable measure in determining both basic and instrumental activities of daily living.
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The objective of the current study is to investigate how well the Katz-15 is able to predict future unfavorable health outcomes and how this is related to the existing Katz-6 scale. DESIGN: We performed a follow-up study using data from a group of 60 year and older participants from a large Dutch clinical trial. PARTICIPANTS: We included 2321 participants in the analysis. The average age of the study population was 74 years and 44% was male. MEASUREMENTS: We studied the relation between the Katz-15 scale and a number of unfavourable health outcomes, such as hospitalization, admission to a nursing home, admission to a home for the aged and death within one year of follow-up. RESULTS: We found the Katz-15 to be both internally consistent and strongly associated with quality of life measures. We observed moderate to strong associations between the Katz-15 and the unfavourable health outcomes All associations studied were stronger for the Katz-15 scale as compared to the Katz-6 scale. 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P. A</au><au>Drubbel, I</au><au>Bleijenberg, N</au><au>Numans, M. E</au><au>De Wit, N. J</au><au>Schuurmans, M. J</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Validity and reliability of the Katz-15 scale to measure unfavorable health outcomes in community-dwelling older people</atitle><jtitle>The Journal of nutrition, health &amp; aging</jtitle><stitle>J Nutr Health Aging</stitle><addtitle>J Nutr Health Aging</addtitle><date>2014-12-01</date><risdate>2014</risdate><volume>18</volume><issue>9</issue><spage>848</spage><epage>854</epage><pages>848-854</pages><issn>1279-7707</issn><eissn>1760-4788</eissn><abstract>OBJECTIVES: To predict the risk of future unfavourable health outcomes in older people it is common to assess the level of both basic and instrumental activities of daily living. 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subjects Activities of Daily Living
Aged
Aging
Biological and medical sciences
clinical trials
Clinical Trials as Topic
death
elderly
Feeding. Feeding behavior
Female
Follow-Up Studies
Frailty
Fundamental and applied biological sciences. Psychology
Geriatric Assessment - methods
Geriatrics/Gerontology
Health sciences
Homes for the Aged - statistics & numerical data
Hospitalization - statistics & numerical data
Humans
Male
Medicine
Medicine & Public Health
Mortality
Netherlands
Neurosciences
nursing homes
Nursing Homes - statistics & numerical data
Nutrition
Older people
Primary care
Primary Care Medicine
Quality of Life
Quality of Life Research
Questionnaires
Reproducibility of Results
Residence Characteristics
risk
Risk Assessment - methods
Surveys and Questionnaires
Validity
Vertebrates: anatomy and physiology, studies on body, several organs or systems
title Validity and reliability of the Katz-15 scale to measure unfavorable health outcomes in community-dwelling older people
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