In the process of adapting the questionnaire to another language, it became necessary to eliminate several questions. The original scale had a three-level interpretation of the total score. A certain interval of the total score indicated an average level of the measured feature, lower scores indicated a low level, and higher scores indicated a high level. How do we calculate the same three-level key for the new adapted scale? Can we use another scale that measures the same parameter and use ROC analysis to identify specific cut-offs for each level?
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