Additional file 3.

Three measures for geographical risk status. To measure geographical risk status by state, we used: (1) cumulative H1N1 cases in the state; (2) cumulative H1N1 cases per million population; and (3) a dichonomous variable to indicate if one or more deaths were reported in the state as of May 27 2009. (1), (2) and the cumulative number of deaths by state are shown in Table A2.

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Ibuka et al. BMC Infectious Diseases 2010 10:296   doi:10.1186/1471-2334-10-296