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(Hoping that I am posting this in the correct page)

Many years ago I was reading an old magazine (perhaps 30 years old or so) and in one of those trivia columns, I read about some hospital where many of its nurses got pregnant simultaneously.

Recently, a few years ago, I heard in the news a similar phenomenon: some nurses got pregnant almost simultaneously. Then I heard/read it again about another hospital, and again.

If you search for "nurses pregnant simultaneously" you will find several links to news articles. For example

https://www.today.com/parents/6-nurses-one-department-all-pregnant-same-time-t133529 From July 2018. This article speaks about 6 simultaneously pregnant nurses.

https://www.bbc.com/news/world-us-canada-45234247 From August 2018. 16 simultaneously pregnant nurses.

https://www.independent.co.uk/life-style/maine-medical-centre-pregnant-nurses-viral-photo-facebook-a8840406.html Most recent case, 9 simultaneously pregnant nurses.

In the same time, 7 firefighters from the same station got also pregnant almost simultaneously. https://www.charlotteobserver.com/news/local/article228478579.html

the news display these cases as some odd and cute "coincidence" without giving an explanation, but the odds are so high that can't be explained as a coincidence. Of course you can talk about coincidence if you refer to 2 persons getting pregnant simultaneously, but if we are talking about 6 or even 16 persons, we have to do with some phenomenon. And if this strange phenomenon is repeated, especially in the same workplace, we have to do with some trend.

Have such cases been obesrved or documented before, and can an explanation be given?

closed as off-topic by Oddthinking Mar 28 at 23:43

This question appears to be off-topic. The users who voted to close gave this specific reason:

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    Why do you think it can't be a coincidence? Some quick googling indicates there are about 6000 hospitals in the us, and that about 90% of nurses are female. Every now and then it's bound to happen. – Mark Mar 28 at 22:03
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    Because they tend to be in a good spot for it financially and chronologically? The chances of getting pregnant within 9 months if you're trying is about 85% so if you have 20 women in a ward and 10 of them are trying to have a baby you'd expect 8–9 others to get pregnant by the time the first of them gives birth. – Kevin Mar 28 at 22:17
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    @Kevin This seems to suggest that's not true – PC Luddite Mar 28 at 22:56
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    @Voprosnik: I have closed, because there is no widely-believed claim here. It just seems to be a speculative idea that you have come up with. – Oddthinking Mar 28 at 23:46
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    “Why do large numbers of coworkers get pregnant simultaneously?” is off topic, but “do large numbers of coworkers get pregnant simultaneously?”is on-topic, and appears to be claimed by the cited articles. – Andrew Grimm Mar 29 at 2:23

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