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Related Experiment Video

Updated: Jun 3, 2026

External Cephalic Version: Is it an Effective and Safe Procedure?

External Cephalic Version: Is it an Effective and Safe Procedure?

Published on: June 6, 2020

Using a simplified Bishop score to predict vaginal delivery.

S Katherine Laughon¹, Jun Zhang, James Troendle

¹From the Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, Maryland.

Obstetrics and Gynecology

|March 9, 2011

Summary

This summary is machine-generated.

A new, simplified Bishop score using dilation, station, and effacement effectively predicts vaginal delivery. This simplified score offers similar predictive accuracy to the original Bishop score for labor induction.

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Area of Science:

Obstetrics and Gynecology
Maternal-Fetal Medicine

Background:

The Bishop score is a standard tool for assessing cervical readiness for labor induction.
The original Bishop score was developed without modern statistical methodologies.

Purpose of the Study:

To evaluate if a simplified Bishop score can predict vaginal delivery as effectively as the original score.
To develop a more statistically robust method for predicting labor induction success.

Main Methods:

Analysis of data from 5,610 nulliparous women undergoing labor induction.
Logistic regression to identify significant components of the Bishop score.
Creation and validation of a simplified score using dilation, station, and effacement.

Main Results:

Dilation, station, and effacement were the only significant predictors of vaginal delivery (P<.01).
The simplified Bishop score (0-9) demonstrated comparable or superior positive predictive value, negative predictive value, and likelihood ratios to the original Bishop score (0-13).
The simplified score maintained similar predictive accuracy across various induction and spontaneous labor populations.

Conclusions:

A simplified Bishop score, utilizing dilation, station, and effacement, provides a similarly high predictive ability for successful labor induction.
This simplified score offers a statistically sound alternative for assessing cervical readiness.