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Table 8 Comparison of mathematical values obtained with optimum cut-off versus the current and original cut-offs recommended by Zung*

From: Norms for Zung’s Self-rating Anxiety Scale

Mathematical ModelOptimum(39/38)Current (36)Original (40)
Youden Index.660.636.650
ROC Curve: distance from point (0,1).243.271.276
  1. * For the Youden Index higher values are desirable, for the ROC curve lower values