Additional file 2.
Table S2. Household income of the Japanese population. Percentage of people in each household income category in the Japanese adult population (Population column) and in the current sample (Sample column). Data is based on the latest national survey (Ministry of Internal Affairs and Communications, as of October 1, 2007).
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Okamoto et al. BMC Medical Informatics and Decision Making 2012 12:104 doi:10.1186/1472-6947-12-104