[ed25519FUUU]

These studies need to keep up until we can fully account for the difference in fatality not only worldwide, but state to state.

Why has Japan, with an older population (median age 47), a tiny island, crowded indoor subways —- has only experienced 900 deaths and never locked down! while some zip codes in New York experiences 2x that amount.

Even state to state the difference is alarming.

[cgh]

Diabetes is likely a factor: https://www.medscape.com/viewarticle/931132

And obesity is strongly correlated with diabetes: https://www.diabetes.co.uk/diabetes-and-obesity.html

There is a distinction to be drawn between obesity rates in the US and Japan and that might be part of the answer to your question.

[nradov]

New York state has about 6× the obesity rate of Japan.