Validity and reliability of Sarcopenia Quality of Life® Indonesia questionnaire in sarcopenic patients

Background:Sarcopenia significantly impairs quality of life(QoL).The Sarcopenia Quality of Life®(SarQol®)questionnaire provides a sarcopenia-specific instrument for the assessment of QoL.The aim of this study was to cross-culturally adapt the SarQol®to an Indonesian language questionnaire and to confirm its validity and reliability as a tool to measure QoL in Indonesian-speaking elderly patients with sarcopenia.Methods:This cross-sectional study translated and cross-culturally adapted the SarQol®questionnaire,followed by evaluating the psychometric properties of the final cross-culturally adapted SarQol®Indonesia questionnaire.Results:Fifty-nine elderly Indonesian subjects(29 sarcopenic and 30 nonsarcopenic)with a mean age of 72.2±6.3 years were included in this study.SarQol®Indonesia questionnaire overall provides a good discriminative value[60.61±14.34 vs.73.60±13.17,p=0.001],good internal consistency(Cronbach'sαcoefficient=0.896 and McDonald'sωcoefficient=0.906,both with good correlation to the questionnaire individual domains),acceptable construct validity,and good test-retest reliability(intraclass correlation coefficient:0.962[95%confidence interval:0.883-0.987]).Conclusions:The SarQol®Indonesia questionnaire provides a conceptual and literally equivalent questionnaire content to its original source with good discriminative value,good internal consistency,acceptable construct validity,and good test-retest reliability.The SarQol®Indonesia questionnaire is ready to be used to measure QoL in Indonesian elderly sarcopenic individuals.