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Table 4 Calculated cut-off values that show the best range of sensitivity and specificity for the C2C6AR

From: Preoperative X-ray C2C6AR is applicable for prediction of difficult laryngoscopy in patients with cervical spondylosis

Cut-off point Sensitivity Specificity Youden index
1.48 0.64 0.76 0.40
1.45 0.67 0.70 0.37
1.42 0.68 0.65 0.33
1.36 0.71 0.60 0.31
1.27 0.75 0.54 0.29
1.26 0.76 0.51 0.27
1.21 0.78 0.43 0.21
1.16 0.81 0.41 0.22
1.14 0.82 0.38 0.20
1.04 0.87 0.35 0.22
1.00 0.88 0.30 1.18
  1. Youden index = sensitivity + specificity-1