Additional file 1.
Table S1. Education levels of the Japanese population. Education histories for different generations and genders. Percentage of people with a high school education or lower in the Japanese adult population for each category is shown based on the latest national survey (Ministry of Internal Affairs and Communications, as of October 1, 2007). Sampling quotas in the current study were allocated according to this proportion.
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Okamoto et al. BMC Medical Informatics and Decision Making 2012 12:104 doi:10.1186/1472-6947-12-104