Excess mortality rates associated with the 2009 A/H1N1 pandemic, the historical A/H3N2 pandemic, and seasonal epidemics by age group, death outcome, and disease burden model.

*Estimates are based on a Poisson regression model linking weekly mortality with weekly incidence of influenza like illness (average based on 4 A/H1N1–B epidemics and based on 7 A/H3N2 epidemics for seasonal epidemics). **Estimates based on the traditional Serfling seasonal regression approach, which does not incorporate indicators of influenza activity.