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Although previously only the benefits of medicines were of interest, recently the safety of their use has attracted attention to prevent medical accidents. Our investigation shows that many medicinal near-miss incidents occur because of similarity in names or appearance among different products. To avoid such confusion, the Ministry of Health, Labour and Welfare in Japan issued a declaration obligating pharmaceutical companies to display bar codes on the label of ethical medicines to avoid medical accidents. To identify what health care professionals perceive as the ideal layout of a label including the bar code, and to assess their awareness of the declaration and response, we conducted a questionnaire survey targeted at pharmacists and nurses. In this article, we apply a data-mining technique to find relationships between respondent attribute data and response data concerning the ideal bar code display for ampoules and awareness of the issued declaration.