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Lumping together 2 very distinct demographic groups.

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The American way

The most interesting nugget seems to be that across the board a bystander is more likely to give you CPR in public them at home...

There are more people in public.

Wouldn’t knowledge of CPR among demographic groups also be a factor?

Which demographic do you assume knows CPR better than the other?

They discuss that in the article. Cited an article showing lower rates of CPR certified persons in the Black community. One of the takeaways was making sure all racial, ethnic, educational, and socioeconomic groups have access to free CPR training. Free CPR training is a public good—because you never know who is going to be next to you when you collapse in the grocery store or parking lot.

You are completely correct. This article is impressive actionable research.

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The ones who do it at home with their own family, unless for some reason theres a racial gap between people's willingness to do CPR. Theres definitely not a fully causal relationship but I can't even posit another reason why this would skew racially at home.

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It's a rate, so the likelihood is higher, it's already adjusted for amount of people