From The Economist
How many people have died because of the covid-19 pandemic? The answer depends both on the data available, and on how you define “because”. Many people who die while infected with SARS-CoV-2 are never tested for it, and do not enter the official totals. Conversely, some people whose deaths have been attributed to covid-19 had other ailments that might have ended their lives on a similar timeframe anyway. And what about people who died of preventable causes during the pandemic, because hospitals full of covid-19 patients could not treat them? If such cases count, they must be offset by deaths that did not occur but would have in normal times, such as those caused by flu or air pollution.
Rather than trying to distinguish between types of deaths, The Economist’s approach is to count all of them. The standard method of tracking changes in total mortality is “excess deaths”. This number is the gap between how many people died in a given region during a given time period, regardless of cause, and how many deaths would have been expected if a particular circumstance (such as a natural disaster or disease outbreak) had not occurred. Although the official number of deaths caused by covid-19 is now 5m, our single best estimate is that the actual toll is 17.1m people. We find that there is a 95% chance that the true value lies between 10.5m and 19.7m additional deaths.
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