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Wouldn't it make sense to consider this being environmental? estrogen-mimicking plastics? phthalates?

Interesting hypothesis

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The changes would be gradual over decades if that were the main reason

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Right, that's my point, it's gradual over decades. OPs data shows sex increasing from about 2008 to 2014, then falling off a cliff after 2014, implying this is not the main cause.

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2018 is pre covid.
Probably looks worse since 2020.

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