II. Interventions & C-Sections
Evidence Based Birth: Friedman's Curve
Outdated labor timelines double the C-section rate
Outdated labor progress standards double the surgery rate. C-section rate under old Friedman's Curve: 22.2%. Under updated guidelines: 10.3%. Many hospitals still use the old standard.
The original Friedman's Curve came from a 1955 study of 500 women that defined normal labor progress. For sixty years, hospitals used it to decide when a labor was failing to progress and a cesarean was warranted.
The 2014 Consortium on Safe Labor used data from 62,000 women to update the timeline, and the results were dramatic. Modern labors are slower than Friedman's curve assumed, especially for first-time mothers. Applying the old curve produces a cesarean rate around 22.2 percent. Applying the updated guidelines drops it to 10.3 percent.
The American College of Obstetricians and Gynecologists formally endorsed the new timeline in 2014. Many hospitals still use the old standard in practice, or use protocols that read modern labors as abnormal when they are simply taking the normal modern amount of time.
22.2%
C-section under old Friedman
10.3%
Under updated guidelines
62,000
Women in the 2014 update
500
Women in the original 1955 study
Why it matters
Sixty years of cesareans were performed against a labor timeline that no longer matches the data. Many hospitals still use the old one anyway.
This is one finding from the research library behind How to Birth a Mother. Everything here traces back to a study, a dataset, or a systematic review.