Fig. 1
From: Prevalence of idiopathic pulmonary fibrosis in Japan based on a claims database analysis
Diagram of the prevalence estimation method. aThe other databases includes the database provided by JMDC, IBM MarketScan Commercial Database, and Medicare 5% sample data. MDV database consists of claims data from acute care hospitals, and does not contain population data. NDB Open Data is a publicly available summary spreadsheet from National Database of Health Insurance Claims and Specific Health Checkups of Japan (NDB), which contains almost all health insurance claims data. In the NDB Open Data, 100 of the most prescribed drugs for each therapeutic category, including pirfenidone, in a one-year period from April are summarized for each age and sex group. IPF Idiopathic pulmonary fibrosis; MDV Medical Data Vision