Yeah, that helps, but it doesn't totally address the selection issue. Parents willing to forego vaccines will differ in other ways too, even if one element is accounted for.

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It would be ideal if they just compared vaccinated to unvaccinated people in general but it’s hard to when you’re risking your career over it. Thank big pharma for that.

For sure. We already know how to do this well, based on experimental designs that were used to study the effects of smoking on pregnancy.

I’m not familiar with those designs