STANDARD ERROR OF MEASUREMENT AND SMALLEST DETECTABLE CHANGE OF THE SARQOL® QUESTIONNAIRE- AN ANALYSIS OF SUBJECTS FROM 8 VALIDATION STUDIES

Author(s)

Geerinck A¹, Beaudart C², Bautmans I³, Cooper C⁴, De Souza Orlandi F⁵, Konstantynowicz J⁶, Montero Errasquin B⁷, Topinkova E⁸, Tsekoura M⁹, Reginster J², Bruyère O²
¹University of Liège, Liège, WLG, Belgium, ²University of Liège, Liège, Belgium, ³Vrije Universiteit Brussel, Brussels, Belgium, ⁴University of Oxford, Oxford, UK, ⁵Federal University of São Carlos, Sao Carlos, Brazil, ⁶Medical University of Bialystok, Bialystok, Poland, ⁷Hospital Universitario Ramón y Cajal, Madrid, Spain, ⁸Charles University, Staré Mesto, Czech Republic, ⁹Technological Educational Institute of Western Greece, Aigio, Greece

OBJECTIVES: The Sarcopenia Quality of Life (SarQoL^®) questionnaire, a sarcopenia-specific patient-reported outcome measure, comprises 55 items incorporated into 22 questions. It produces 7 domain scores and 1 overall quality of life score, all between 0 and 100. This study aims to contribute to the interpretation of the SarQoL^® scores by calculating the standard error of measurement (SEM) and smallest detectable change (SDC) in a sample of subjects from 8 studies.

METHODS: Subjects from 8 studies (conducted in Belgium, Brazil, Czech Republic, England, Greece, Poland and Spain) that had previously examined the test-retest reliability of the SarQoL^® questionnaire were included. The SEM, a measure of the error in the scores that is not due to true changes, was calculated by dividing the standard deviation of the difference between test and retest scores (SD_diff) by √

Conference/Value in Health Info

2018-11, ISPOR Europe 2018, Barcelona, Spain

Value in Health, Vol. 21, S3 (October 2018)

Code

PRM198

Topic

Methodological & Statistical Research

Topic Subcategory

PRO & Related Methods

Disease

Musculoskeletal Disorders

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Presentation