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Table 6 Prediction of vaginal delivery -- Bishop score vs. cervical resistivity with 12 mm probe (data shown for 4 frequencies 9.8-78.1 kHz).

From: The role of cervical Electrical Impedance Spectroscopy in the prediction of the course and outcome of induced labour

  AUC (95% CI) Optimal cut-off value Sensitivity % (95% CI) Specificity % (95% CI) +LR -LR PPV (%) NPV(%)
Bishop score 0.57 (0.50- 0.64) ≤ 3 30.30 (15.6 - 48.7) 86.0 (79.8 - 90.8) 2.16 0.81 29.4 86.5
Frequency of CR         
9.8 kHz 0.62 (0.55-0.69)* <1.92 Ω.m. 93.55 (78.5 - 99.0) 30.36 (23.5 - 37.9) 1.34 0.21 19.9 96.2
19.5 kHz 0.63 (0.56-0.70)* <2.03 Ω.m. 87.10 (70.1 - 96.3) 35.12 (27.9 - 42.8) 1.34 0.37 19.9 93.7
39.1 kHz 0.66 (0.58-0.72)** <2.24 Ω.m. 70.97 (52.0 - 85.7) 53.57 (45.7 - 61.3) 1.53 0.54 22.0 90.9
78.1 kHz 0.66 (0.59-0.72)** <2.25 Ω.m. 70.97 (52.0 - 85.7) 56.55 (48.7 - 64.2) 1.63 0.51 23.2 91.3
  1. CR cervical resistivity, AUC Area Under the ROC Curve, LR Likelihood ratio, PPV positive predictive value, NPV negative predictive value, ** P < 0.01 level, * P < 0.05.