https://jama.jamanetwork.com/article.aspx?articleid=2513561
So in fact doing something about the "divide between the rich and poor" is unlikely to help. It might even be counterproductive if it reduces income (which is highly correlated) and if this effect is causal.
https://data.oecd.org/healthstat/life-expectancy-at-birth.ht...
I expect that Delhi/Shanghai magnitude physical environment factors is also important. But luckily the US is a lot cleaner.
From the results section: "inequality in life expectancy increased over time. Between 2001 and 2014, life expectancy increased by 2.34 years for men and 2.91 years for women in the top 5% of the income distribution, but by only 0.32 years for men and 0.04 years for women in the bottom 5% (P < .001 for the differences for both sexes)."
So I think the co-authors had a point when they talked about retirement age!
The CIs for income inequality (as well as health care factors and local labor market conditions) do not exclude zero.