Purpose. Objective of the present study was to see the correlation of subjectively measured KOOS questionnaire with objectively measured 6-minute walk test (6-MWT), age, height, weight, and BMI. Participants. 251 subjects with OA knee based on American College of Rheumatology criteria. Methods. After passing inclusion and exclusion criteria, the following parameters were recorded: age, height, weight, and BMI. Then subjects were asked to fill KOOS questionnaire; then all subjects were asked to do self-paced walk for 6 minutes. Analysis. Spearman rank test was done to see the correlation. Significant level was set at . Results. 6-MWT had a weak correlation with KOOS-ADL (rho 0.461) and strong correlation with KOOS-symptom, KOOS-pain, and KOOS-sports and very strong correlation with KOOS-QOL. BMI had a strong correlation with KOOS-pain, KOOS-symptom, KOOS-ADL, and KOOS-sports and very strong correlation with KOOS-QOL. Weight had a weak correlation with KOOS-symptom, KOOS-ADL, and KOOS-sports and strong correlation with KOOS-pain and KOOS-QOL. All the above values were significant with . Conclusion. KOOS is strongly positively correlated with 6-MWT and negatively correlated with BMI. Its correlation strength has decreased with weight. 1. Introduction Osteoarthritis (OA) in knee joint is the most common reason behind functional disability that leads to lowered quality of life in old age people of India. Some of the objective factors that may influence OA disease severity include but are not limited to age, height, weight, and BMI. In physiotherapy practice, lowering the pain, other symptoms, improving the activities of daily living (ADL), and quality of life (QOL) are main outcome criteria for OA knee rehabilitation. To achieve this rehabilitative goal, physiotherapists use both self-reported questionnaires as well as performance-based tests to monitor prognosis in the above said parameters, that is, pain, symptoms, ADL, and QOL. Self-reported questionnaires give subjective information about the disease process without examiner bias within short period of time [1], whereas, performance-based tests objectively measures patient’s ability of perform ADL activities. Examples for self-reported questionnaire are WOMAC, SF-36, KOOS, and so forth. Examples for physical performance tests are timed up and go test (TUG), six-minute walk test (6-MWT), stair climbing test, and so forth [2]. Physical performance tests are affected by motivation and not affected by psychogenic factors such as beliefs, expectations, cognitive impairments, and cultural, lingual, and
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