## Decades of Risk Retrogression

Decades of risk retrogression is a way to answer the question "How dangerous is COVID-19?" from a historical perspective.

As an alternative to looking at number of deaths per week a mathematical formula can convert weekly deaths per million into a more intuitive measure of:

How many decades before 2020 must your retrogress to be living hypothetically with similar risk of Pathogenic Pulmonary Disease?

The previous plots are redrawn below to this new scale of decades of risk retrogression.