Table 1

Background information about each site

Main components of organisationHospital system and physician groupIndependent practice association and hospital systemIndependent practice association and hospital systemIntegrated delivery system
Attributed Medicare population size5000–10 00010 000–30 00010 000–30 000>30 000
Approximate population of main geographical area<200k200k–1 million>1 million>1 million
Number of ACO interviews8768
Number of Public health agency interviews2323
  • ACO, accountable care organisation.