Read the article. If the unborn baby dies during the third trimester, they list it as a stillbirth, not a miscarriage. If you exclude the third trimester deaths, and only look at the first two trimesters, then the 4 out of 5 number is correct. The New England journal is playing language games to hide the truth.
Try reading the actual study! The article is clearly misinterpreting the results.
The numbers are are ALL skewed because the study IS NOT DONE! Several thousand women participated in the study and most of them are still pregnant. The 827 number is only the portion of participants who have completed their pregnancy. This skews the data by artificially selecting data points of 1) women who were close to term at the start and 2) all of the miscarriages from a MUCH larger population. We have no idea what the actual miscarriage rate is until The remainder of the participants come to term. If you look at 'early numbers' of course the numbers will be heavily skewed to miscarriages because miscarriages finish early!
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