Background: The aim of the current study was to analyze the structure and to survey the state of Japanese
health literacy scales. Methods: Databases, such as CiNii, Medical Online, google scholar, and the National Diet Library,
were searched using the keywords "health literacy" and "scale" separately or in combination. Based on the definition of
health literacy from the World Health Organization, all of the items on those health literacy scales were categorized into
the three following components: "motivation," "knowledge," and "ability." Results: The search revealed 12 health literacy
scales. Items on those scales were classified into three components: 21 items (15.8%) related to "motivation," 57 (42.9%)
related to "knowledge," and 54 (40.6%) related to "ability." The three components were further broken down into subcomponents.
Two less prevalent aspects of "motivation" were <interest> (4 items, in 19.0% of scales) and <communication>
(1 item, 4.8%). Two less prevalent aspects of "knowledge" were <searching> (4 items, 7.0%) and <utilization of
information> (1 item, 1.8%). Two less prevalent aspects of "ability" were <communication skills> (7 items, 13.0%) and
<decision-making> (5 items, 9.3%). Discussion: Hopefully, new health literacy scales that balance the three components
identified here will be developed depending on the purpose of use and target population.
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