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Related Experiment Video

Updated: May 22, 2026

Electromyometrial Imaging of Uterine Contractions in Pregnant Women

Electromyometrial Imaging of Uterine Contractions in Pregnant Women

Published on: May 26, 2023

Changes in labor patterns over 50 years.

S Katherine Laughon¹, D Ware Branch, Julie Beaver

¹Eunice Kennedy Shriver National Institute of Child Health and Human Development, Bethesda, MD, USA.

American Journal of Obstetrics and Gynecology

|May 1, 2012

Summary

This summary is machine-generated.

Modern labor patterns show significantly longer labor durations compared to the 1960s. This trend in labor progression is linked to increased maternal age, weight, and interventions like epidurals and oxytocin.

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Obtaining Specimens with Slowed, Accelerated and Reversed Aging in the Honey Bee Model

Published on: August 29, 2013

Area of Science:

Obstetrics and Gynecology
Reproductive Health
Clinical Epidemiology

Background:

Labor patterns have evolved over decades.
Understanding contemporary labor progression is crucial for clinical practice.
Historical data provides a benchmark for modern obstetric outcomes.

Purpose of the Study:

To compare labor patterns between a historical cohort (1960s) and a modern cohort in the United States.
To identify changes in labor duration and interventions over time.

Main Methods:

Retrospective cohort study comparing data from the Collaborative Perinatal Project (CPP, 1959-1966) and the Consortium on Safe Labor (CSL, 2002-2008).
Analysis included term, spontaneous labor, cephalic, singleton pregnancies.
Statistical adjustments were made for maternal and pregnancy characteristics.

Main Results:

Modern cohort (CSL) women were older and had higher BMIs than the CPP cohort.
Epidural anesthesia, oxytocin use, and cesarean delivery rates were substantially higher in the CSL.
The first stage of labor was longer in the CSL cohort, by 2.6 hours for nulliparas and 2.0 hours for multiparas, even after adjustments.

Conclusions:

Labor is significantly longer in contemporary obstetric cohorts compared to the 1960s.
Changes in practice patterns, including increased interventions, appear to contribute to prolonged labor.
The clinical benefits and necessity of extensive interventions warrant further investigation.