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A Randomized, double-blind trial chart. The population size (N) was 258, the confidence level was 95%; the hypothesized percentage frequency of N was 79±5%, the confidence limit was 5%, and the design effect for cluster surveys was 1. WOMAC, Western Ontario and McMaster Universities Osteoarthritis Index; TUG, Timed “Up-and-Go”; SLS, single-limb stance; VAS, visual analog scale.
