Table 1. Number of expected and observed deaths of centenarians during the 2020 pandemic (March 10 - December 31) considering three periods, before, during and after the Spanish flu pandemic and estimated over-mortality.

Period of observation		At risk population March 10, 1918	Observed deaths	Expected deaths	Excess mortality ratio	5% confidence interval
January 1, 1917	July 31, 1918	501	180	144	125.0%	7.0%
August 1, 1918	May 31, 1919	370	138	96	143.8%	8.1%
June 1, 1919	December 31, 1920	2264	765	538	142.2%	3.4%