A validation study of a smartphone application for functional mobility assessment of the elderly

Matthew H.M. Chan, Donald T.F. Keung, Steve Y.T. Lui, Tsz Hei Cheung

Research output: Journal article publicationJournal articleAcademic researchpeer-review

12 Citations (Scopus)


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.
Original languageEnglish
Pages (from-to)1-4
Number of pages4
JournalHong Kong Physiotherapy Journal
Publication statusPublished - 1 Dec 2016


  • aging
  • five-time sit-to-stand
  • geriatric assessment
  • physical examination
  • timed up-and-go

ASJC Scopus subject areas

  • Physical Therapy, Sports Therapy and Rehabilitation


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