Content validity and reliability of the modified international classification of functioning, disability and health (ICF) core set for osteoarthritis (Thai version) in patients with knee osteoarthritis

Abstract

The objective of this study to develop the International Classification of Functioning, Disability and Health (ICF) core set for knee osteoarthritis (OA) in a Thai version, and to examine the content validity and test-retest reliability. The ICF core set for OA, English language was selected and modified as Thai version ICF. Three 3 assessors who have professional education and skill were consultants for appropriate Thai language of the ICF core set for OA. Thirty-six patients with knee OA aged average 67.50 ± 7.5 years (34 females) who were living in the district of Roi-et province were completely asked and assessed the ICF core set for OA for the test-retest reliability test. The results showed that testing the content validity index was 1 of all items and of overall scale was excellent. There were significantly high reliability for body function domains (ICC= 0.90, 95%CI: 0.81 - 0.95), and activity and participations domains (ICC = 0.92, 95%CI: 0.90- 0.95), p-value<0.001. Environment factors domains was significantly moderated reliability (ICC = 0.67, 95%CI: 0.49 - 0.81). Conclusion, the modified ICF core set for knee OA in a Thai version showed the good content validity and reliability; however, this ICF core set for OA assessment studied only rural community for Thai patients with knee OA. Further study needs to be supported by more empirical evidence in various sociocultural contexts.