COVID-19 Research Paper Volume 13, Issue 18 pp 21855—21865

Centenarians exposed to the Spanish flu in their early life better survived to COVID-19

Identifying the best cut point as the larger difference of the EMR calculated between two adjacent periods of 12 months, from 1917-1920.

Figure 3. Identifying the best cut point as the larger difference of the EMR calculated between two adjacent periods of 12 months, from 1917-1920.