The Spearman and Pearson Correlation Coefficients between the excess all-cause mortalities and antigenic distances to previous individual antigenic strains.

The numbers in parenthesis indicate the P-values of corresponding coefficients. The largest coefficient for each (sub)type is highlighted in bold.
aThe previous ith antigenic strain is the i-th antigenic strain prior to an antigenic strain that is considered as a challenging strain.
bNot applicable due to the limited number of antigenic strains.