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).

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


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.

Jokhi et al. BMC Pregnancy and Childbirth 2009 9:40   doi:10.1186/1471-2393-9-40

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