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Translation and Psychometric Evaluation of the Persian Version of Knee Outcome Survey-Activities of Daily Living Scale (Kos-Adls) Publisher Pubmed



Minoonejad H1 ; Henteh MA1 ; Keshavarz R2 ; Safarzadeh M1 ; Montazeri A3, 4
Authors
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Authors Affiliations
  1. 1. Department of Sports Injury and Biomechanics, Faculty of Sport Sciences and Health, University of Tehran, Tehran, Iran
  2. 2. Department of Physiotherapy, School of Rehabilitation, Tehran University of Medical Sciences, Tehran, Iran
  3. 3. Population Health Research Group, Health Metrics Research Center, Iranian Institute for Health Sciences Research, Tehran, Iran
  4. 4. Faculty of Humanity Sciences, University of Science and Culture, Tehran, Iran

Source: BMC Musculoskeletal Disorders Published:2023


Abstract

Background: The present study aimed to translate and validate the Knee Outcome Survey-Activities of Daily Living Scale (KOS-ADLS) in Iran. Methods: Following standard forward and backward translation procedure, content and face validity were tested by specialists and a sample of 32 patients. Then, in a cross sectional study, a sample of patients with knee disorders, recruited through simple sampling, completed the KOS-ADLS and the Short-Form Health Survey (SF-36) in their first visit to physiotherapy clinics in Tehran. Regarding construct validity, the Spearman’s correlation (rs) and one-way ANOVA were employed to evaluate the correlations between the Persian KOS-ADLS and SF-36 subscales (convergent validity) and known groups comparison, respectively. Test-retest reliability and internal consistency were evaluated by intraclass correlation coefficient (ICC) and the Cronbach’s α coefficient. Results: In total 101 patients were included in the study. The mean age of patients was 42.39 (SD = 9.2). The finding indicated that the KOS-ADLS had strong correlations with SF-36 physical functioning, bodily pain subscales, and also physical component summary while it had lower correlations with other subscales of the SF-36 as expected. The KOS-ADLS was able to differentiate between the subgroups of patients who differed in BMI. The acceptable level of intraclass correlation coefficient (ICC = 0.91) and Cronbach’s α coefficient (α = 0.91) was obtained for the Persian KOS-ADLS. Also no floor and ceiling effects were observed for the questionnaire. Conclusions: The Persian version of KOS-ADLS was found to be a reliable and valid outcome measure for assessing daily living activities in patients who suffer from knee pathological conditions. © 2023, BioMed Central Ltd., part of Springer Nature.
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