Correlations between coenzyme Q10 status and muscle mass. (A) Correlation between coenzyme Q10 status and whole-body muscle mass. OA group: r = 0.27, p < 0.01; OA + non-OA group: r = 0.24, p < 0.01; (B) Correlation between coenzyme Q10 status and trunk muscle mass. OA group: r = 0.24, p = 0.02; OA + non-OA group: r = 0.24, p < 0.01; (C) Correlation between coenzyme Q10 status and WSMI. OA group: r = 0.26, p < 0.01; OA + non-OA group: r = 0.26, p < 0.01; (D) Correlation between coenzyme Q10 status and ASMI. OA group: r = 0.24, p = 0.02; OA + non-OA group: r = 0.24, p < 0.01. ASMI, appendicular skeletal muscle mass index; OA, osteoarthritis; TC, total cholesterol; WSMI, whole skeletal muscle mass index.