Epidurals are widely used and widely trusted for pain relief during labor. So when a 2020 study reported that they might be linked to autism, it raised a troubling question: could a routine medical decision have long-term consequences? We follow that claim from headline to evidence—and watch what happens when other scientists take a closer look. We dig into the original study, a wave of replication studies from around the world, and a meta-analysis that tries to make sense of it all. Along the way, we unpack hazard ratios, Cox regression, inverse probability weighting, and sibling analyses—and why even sophisticated statistical adjustment can’t eliminate confounding. Plus: why bigger datasets don’t solve everything, what happens when results shrink after adjustment, and how a controversial study turned into a case study in science working as it should. Bonus: our first guest journalist interview!

Statistical topics

  • Confounding
  • Cox regression
  • Hazard ratios
  • Inverse probability weighting (IPTW)
  • Multivariable adjustment
  • Observational studies
  • Residual confounding
  • Retrospective cohort studies
  • Sibling analysis
  • Statistical adjustment
  • Statistical significance vs practical significance
  • Survival analysis

Methodological morals

  • “Every time you adjust the model and the effect gets smaller, that's the universe whispering, maybe don't build a causal story out of this.”
  • “Consistency across studies is gold.”
  • “There's more to the story than the statistics.”



References



Kristin and Regina’s online courses: 

Demystifying Data: A Modern Approach to Statistical Understanding  

Clinical Trials: Design, Strategy, and Analysis 

Medical Statistics Certificate Program  

Writing in the Sciences 

Epidemiology and Clinical Research Graduate Certificate Program 

Programs that we teach in:

Epidemiology and Clinical Research Graduate Certificate Program 


Find us on:

Kristin -  LinkedIn & Twitter/X

Regina - LinkedIn &ReginaNuzzo.com


  • (00:00) - Intro
  • (01:40) - Why autism is hard to study
  • (05:18) - The original 2020 study
  • (11:38) - Results & hazard ratios
  • (15:24) - Confounding & adjustment
  • (26:32) - Criticism & plausibility
  • (34:11) - Replications begin
  • (44:38) - Converging evidence & meta-analysis
  • (50:48) - What does it mean?
  • (53:38) - Guest & wrap-up

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