Wealthy Americans have death rates on par with poor Europeans

Some wealthy Europeans have death rates 35 percent lower than the richest Americans.

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[Lexus Lunar Lorry]

For each region, participants were divided into wealth quartiles, with the first being the poorest and the fourth being the richest.

Quartiles seems insufficiently granular to handle the US level of wealth inequality. The top 25% of Americans includes a lot of white collar professionals like tech employees. A more interesting scheme may be percentiles: how do the American top/bottom 1% or 0.1% compare to their European equivalents?