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Title: A validation study of a smartphone application for functional mobility assessment of the elderly
Authors: Chan, MHM 
Keung, DTF 
Lui, SYT 
Cheung, RTH 
Keywords: Aging
Five-time sit-to-stand
Geriatric assessment
Physical examination
Timed up-and-go
Issue Date: 2016
Publisher: Elsevier
Source: Hong Kong physiotherapy journal, 2016, v. 35, p. 1-4 How to cite?
Journal: Hong Kong physiotherapy journal 
Abstract: Background To minimize the reaction time and position judgment error using stopwatch-timed measures, we developed a smartphone application to measure performance in the five-time sit-to-stand (FTSTS) and timed up-and-go (TUG) tests.
Objective This study aimed to validate this smartphone application by comparing its measurement with a laboratory-based reference condition. Methods Thirty-two healthy elderly people were asked to perform the FTSTS and TUG tests in a randomized sequence. During the tests, their performance was concurrently measured by the smartphone application and a force sensor installed in the backrest of a chair. The intraclass correlation coefficient [ICC(2,1)] and Bland–Altman analysis were used to calculate the measurement consistency and agreement, respectively, between these two methods.
Results The smartphone application demonstrated excellent measurement consistency with the lab-based reference condition for the FTSTS test [ICC(2,1) = 0.988] and TUG test [ICC(2,1) = 0.946]. We observed a positive bias of 0.27 seconds (95% limits of agreement, −1.22 to 1.76 seconds) for the FTSTS test and 0.48 seconds (95% limits of agreement, −1.66 to 2.63 seconds) for the TUG test.
Conclusion We cross-validated the newly developed smartphone application with the laboratory-based reference condition during the examination of FTSTS and TUG test performance in healthy elderly.
ISSN: 1013-7025
EISSN: 1876-441X
DOI: 10.1016/j.hkpj.2015.11.001
Rights: Copyright © 2016, Hong Kong Physiotherapy Association. Published by Elsevier (Singapore) Pte Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons. org/licenses/by-nc-nd/4.0/).
The following publication Chan, M. H., Keung, D. T., Lui, S. Y., & Cheung, R. T. (2016). A validation study of a smartphone application for functional mobility assessment of the elderly. Hong Kong Physiotherapy Journal, 35, 1-4 is available at
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