The COVID-19 statistic Trump is hanging his hat on.

Background

I was watching the Fox News interview with Chris Wallace and Donald Trump, when Trump said "I heard we had one of the lowest, maybe the lowest mortality rate in the world", and brought out a piece of paper to "prove" it.

No reasonable person could believe the claim, since the US has 433 deaths per million population, but if you watch carefully, at 2:30 into the interview (embedded at the end), you can catch the heading on the piece of paper Trump waves:

"Case fatality rate of COVID-19".

What does it mean?

The best interpretation for the US is simply: the total number of deaths divided by total number of cases.

Needless to say, the USA is not, in fact, best in the world even on that metric.

The US has a very respectable 3.68%, with the range being between 28% (in war- and famine-torn Yemen), and 0% (in mostly small, isolated countries and islands).

Many countries, though, have better "case fatality rates". South Korea's, for example is 2.15%

(I'll work from a snapshot of https://www.worldometers.info/coronavirus/ from today for my figures.)

Why it's a bad statistic

Now, it's an interesting statistic, because it's not a measure of how well the virus is being contained or managed, it's a measure of how well the hospitals have managed to keep people alive so far, and no-one disputes that US hospitals are second to none.

The problem with that is that it doesn't take into account that the main objective when fighting an epidemic is to keep the most people alive.

Currently, about 1% of the population has had the virus, about 4% of them are dead (and half are still ill).

At 60,000 new cases a day (rising daily), a 3.6% case death rate is over 2,000 deaths a day, a few weeks later.

The death rate is already climbing from a low of 517 near the beginning of the month, to 791 today (seven day moving average). That tracks the increase in cases that started three weeks earlier, from a low of 21,000 new cases a day, to around 30,000 two weeks later, also a 50% increase.

Meanwhile, in Europe, new case and death numbers are at about a tenth of their peak values, and looking fairly steady, and the countries that were hit the hardest were hit early on, when we were still feeling our way (similar to NY, NJ, etc.).

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The COVID-19 statistic Trump is hanging his hat on.
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