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Table 1: 
Results of receiver-operator characteristic (ROC) analysis for cutoff value for the definition of a positive result
Cutoff Value (%)Sensitivity (%)Specificity (%)Accuracy (%)Positive Predictive Value (%)Negative Predictive Value (%)
≥010004545-
≥109121524875
≥208926544975
≥307940575170
≥407250605469
≥507074726975
≥606078706870
≥705786737771
≥803690667463
≥902191606759
=10041005710056
  • Note:—Cutoff value indicates the cutoff value of percent decrease in radiating pain compared with the pre-injection state.