Fig. 5From: Nationwide comprehensive epidemiological study of rare diseases in Japan using a health insurance claims databaseHeatmap of the number of diseases by prevalence category in Orphanet and NDB—Japanese patients. The figure showed the relationship focusing on Japanese data in Orphanet. We omitted the values of “Specific population, “Not yet documented,” and “Unknown” in Orphanet. As Orphanet sometimes displays more than one prevalence category for a disease, we adopted a median category to represent comparabilityBack to article page