According to a recent analysis of 153 clinical registries that collect data on patient outcomes:

• Only 16.2% of the 117 specialty societies of the American Medical Association were affiliated with a registry
• 26.1% of the registries were associated with government funding
• 18.3% of the registries audited data
• 23.5% of the registries risk adjusted outcomes
• Just 2% of registries were associated with mandatory public reporting of hospital outcomes for all participating hospitals

Source: "Prevalence and Data Transparency of National Clinical Registries in the United States." Journal for Healthcare Quality, abstract only, April 24, 2015, http://journals.lww.com/jhqonline/Abstract/publishahead/Prevalence_and_Data_Transparency_of_National.99939.aspx