Validity and Reliability of Mini OAKHQoL Questionnaire in Knee Osteoarthritis: A Methodological Study

Introduction: Osteoarthritis (OA) is a common degenerative disease, particularly among women, which can lead to disability and a decreased quality of life. The decline in quality of life among OA patients can be measured using the Mini OAKHQoL-Ina (Osteoarthritis Knee and Hip Quality of Life Indonesia); however, its validity and reliability have not been tested in Indonesia to date. This study aims to evaluate the reliability of the Mini OAKHQoL-Ina questionnaire in Indonesian OA patients. Methods: This study employed an observational design with a methodological research approach. A total of 65 subjects were selected through purposive sampling. Validity was assessed using Pearson's Product-Moment correlation, while reliability was evaluated using Cronbach’s Alpha to determine the instrument's internal consistency. Results: The analysis revealed that the Mini OAKHQoL-Ina demonstrated good validity across 16 questionnaire items. Internal consistency testing indicated high reliability, with a Cronbach’s Alpha score of 0.828 and an Intraclass Correlation Coefficient (ICC) above 0.9 (excellent) for test-retest reliability. Conclusion: The Mini OAKHQoL-Ina has been proven to possess good validity across 16 items and high reliability in measuring the quality of life of knee osteoarthritis patients. Therefore, this questionnaire can be applied to assess the quality of life of osteoarthritis patients in Indonesia and serve as a basis for designing more effective interventions. Keywords: Quality of Life, Mini OAKHQoL, Reliability, Validity