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Well dang, I guess in hospital success rates for CPR are <20% survival to discharge. Outside of hospital they are < 10% and quickly drop. Sort of terrifying, even though I've done CPR training many times for work I was of the impression that success rates were much higher.

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It's low with CPR alone, but getting an AED involved (which should be accessible in most urban places these days) raises the chances to 50-70%.

They're cheap enough now for normal people to own one.

I carry one in my car as well as a bleed kit, and some other bits and pieces I'm qualified to use (oropharyngeal airways and a bag valve mask respirator).

They're $600 refurbished for anyone wondering.

Depends on the country, but as low as $599 AUD ($378 USD) brand new.

https://cellaed.io/au/products

Look more carefully at that 50 to 70% figure. It is exaggerated (or at least misleading to directly compare) because the usually cited studies are assuming an arrest with a shockable rhythm (and timely, and correct AED application), but only 30 to 40% of out of hospital cardiac arrests have a shockable rhythm, so the overall survivability is not over 50%. Practically speaking even with an AED present its more like 20-30% and that is just survivability, not taking into account long term deficits.

Where can I find those numbers?

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