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International Psychogeriatrics International Psychogeriatrics

Article contents

Relative and absolute reliability of functional performance measures for adults with dementia living in residential aged care

Published online by Cambridge University Press:  03 July 2014

Benjamin Fox Open the ORCID record for Benjamin Fox[Opens in a new window] ,
Timothy Henwood ,
Christine Neville  and
Justin Keogh
Benjamin Fox*
Affiliation:
University of Queensland, School of Nursing and Midwifery, Herston, Queensland, Australia
Timothy Henwood
Affiliation:
University of Queensland, School of Nursing and Midwifery, Herston, Queensland, Australia Faculty of Health Sciences and Medicine, Bond University, Gold Coast, Queensland, Australia
Christine Neville
Affiliation:
University of Queensland, School of Nursing and Midwifery, Herston, Queensland, Australia
Justin Keogh
Affiliation:
Faculty of Health Sciences and Medicine, Bond University, Gold Coast, Queensland, Australia Human Potential Centre, AUT University, Auckland, New Zealand Cluster for Health Improvement, Faculty of Science, Health, Education and Engineering, University of the Sunshine Coast, Maroochydore, Queensland, Australia
*
Correspondence should be addressed to: Benjamin Fox, PhD Candidate, University of Queensland/Blue Care Research and Practice Development Centre, 56 Sylvan Road, Toowong, Queensland 4066, Australia. Phone: +617-3720-5617. Email: ben.fox@uqconnect.edu.au.
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Abstract

Background:

This pilot investigation aimed to assess the relative and absolute test–retest reliability of commonly used functional performance measures in older adults with dementia residing in residential aged care facilities.

Methods:

A total of 12 participants were tested on the Short Physical Performance Battery (SPPB), the Balance Outcome Measure for Elder Rehab (BOOMER), hand grip strength, anthropometric measures and Bio-electric Impedance Analysis (BIA). This study utilized a seven-day test–retest evaluation. Intra-class Correlation Coefficients (ICC) were used to assess relative reliability, Typical Error of Measurement (TEM) was used to assess the absolute reliability, and Bland–Altman plots were used to assess group and individual levels of agreement.

Results:

With the exception of Standing Balance (ICC = 0.49), 2.4-m walk (ICC = 0.68), functional reach (ICC = 0.38), and static timed standing (ICC = 0.47), all measures demonstrated acceptable (>0.71) ICCs. However, only the anthropometric measures demonstrated acceptable levels of absolute reliability (>10% TEM). Bland–Altman analysis showed non-significant (p > 0.05) mean differences, and eight out of the 17 measures showing wide Limits of Agreement (LoA).

Conclusions:

Current measures of functional performance are demonstrably inappropriate for use with a population of older adults with dementia. Authors suggest aligning current measurement strategies with Item Response Theory as a way forward.

Keywords

dementiaAlzheimer’sreliabilitypsychometricsmobilitybalancestrengthmeasurement
Type
Research Article
Information
International Psychogeriatrics , Volume 26 , Issue 10 , October 2014 , pp. 1659 - 1667
Copyright
Copyright © International Psychogeriatric Association 2014 

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