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Wong Scale-Revised. The Wong Scale-Revised consists of nine questions used to evaluate the quality of a study. Once applied, various scores are generated that determine the validity of the paper based on a scale of 1–3, with 1 = inappropriate, 2 = mediocre, 3 = appropriate. A comprehensive score falls in the range of 9–27 points. Studies whose scores sum a total of 18 or less are rejected while those scoring 19 or over are accepted [modified from (21)].
