Possible explanations for why some countries were harder hit by the pandemic influenza virus in 2009 - a global mortality impact modeling study.

total health expenditure Step 3: Assess whether there is an association between the risk factor and the GLaMOR generated pandemic mortality data For all countries, regress (=3) the risk factor with the GLaMOR generated data from (1) For all countries, regress (=4) the risk factor with the GLaMOR generated data from (2) Step 4: Examine the relation of the risk factor with the pandemic mortality data Check how the regression coefficients vary between (3) and (4)? For example, if (3) is not significant and (4) is significant, the risk factor may be significant (see the Decision Rule Set (see: Additional file 1 - Technical Appendix) for all possibilities) Check the direction of the association (the regression coefficient 4)) based on the published literature.

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