Thread by @jsm2334

Co-author of paper claiming COVID-19 vaccines linked to miscarriage says he’s retracting it – Retraction Watch retractionwatch.com/2021/11/16/co-…

This paper was really embarrassingly ignorant — they purported 91% miscarriage rate from reanalysis of NEJM suggesting miscarriage rate was not high after vaccination.

They take subset of first trimester “completed pregnancies” and noted nearly all ended in miscarriage …

But ignored the fact that given the timing of the study there was no way for the women vaccinated in first trimester to have delivered a full term baby yet, so of course the “completed pregnancies” were the miscarriages.

They ignored the many women vaccinated in first trimesters whose pregnancies were fine and they would later go on to deliver a healthy newborn.

When considering this censoring there were no excess miscarriages evident.

I pointed out this error of logic in my blog post in July when there was lots of buzz from claims that vaccines were causing miscarriages

covid-datascience.com/post/nejm-pape…

This specious argument of vaccines causing miscarriages based on this misunderstanding was broadly promoted by many anti vaccine activists, including Steve Kirsch @stkirsch @VaccineTruth2 as I pointed out in my critique of his DarkHorse podcast in July

covid-datascience.com/post/are-the-m…

Here is the link to the erroneous paper being retracted:

…d-4d71-89ff-9fe2d3ad957f.filesusr.com/ugd/adf864_2bd…