Characteristics of major categories by economic status (A), and use of “arachnoiditis” terminology in subcategories of DLMs (B): All sources were divided into major categories, then further divided into subcategories.

Part A shows numbers of papers, total patients, and numbers from N-OECD and OECD. Part B shows papers, sources, those who had diagnoses of DLMs (without the term “arachnoiditis”), and % of total population in the specific subcategory who had diagnoses of DLMs (inclusive of arachnoiditis). Of 887 sources, 2 had undeclared location of patients, removed from economic columns for clarity.