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Health Data & Statistics

Guide to locating sources of numerical data and health statistics

Private Organizations

You may gather statistical information from private organizations that conduct research, for example:

What is Grey Literature?

Grey literature (GL) is defined as:

  • materials not published commercially or indexed by major databases
  • "Fugitive," "ephemeral," "invisible" literature that may be unpublished, unevaluated, not peer-reviewed
  • "Information produced on all levels of government, academics, business and industry in electronic and print formats not controlled by commercial publishing i.e. where publishing is not the primary activity of the producing body." (Luxembourg, 1997 - Expanded in New York, 2004,

Grey Literature may exist in any number of formats:

  • reports
  • preprints
  • conference abstracts and proceedings
  • white papers
  • theses, bibliographies
  • pamphlets
  • official documents
  • newsletters
  • trial registrations
  • patents
  • informal communication (that may include interviews, blog postings, podcasts, personal communication such as email)
  • website information
  • web repositories
  • and more!

 Read more about grey literature:

Sources for Locating Grey Literature:

The following collections of resources offer suggested search engines or databases that can be used to look for different types of grey literature:

For additional sources, visit: 

Clinical Trial Registries

Research In Progress

Reports, Open Archives & Repositories


Meetings & Conference Proceedings

Theses & Dissertations