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Tark1nn t1_itgf25d wrote

I'd guess it be probably similar cause a dude who graduates from polytechnique doesn't end up marrying a "commoner", goes the other way around too.

But it was probably easier for them to find a father who went through those scools for the survey than a mother. Very few females in some of those schools as of today : Polythechnique is 15% women in 2022 so imagine in 1990.
Today, Sciences Po would be 60% women (not official stat, but from my experience), and ENA less than 40%. The other schools are roughly like polythehnique cause it's sciences so fair to imagine it doesn't go over 30%.

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