“…We also measured a set of factors for use as covariates in analysis. These included the number of performance management activities (a count across the following: individual financial rewards, nonfinancial awards/recognition, physician performance on quality reports, and one-on-one review of physician quality performance) and the types of ownership (categorical, including, by an independent owner, a larger physician group, a hospital, a health care system, or other), as past research has indicated that the explicitness of performance management activities and types of ownership were key determinants of ACO performance (Peckham et al, 2019). We measured the practice sites’ experience with various payment arrangements in the past, as this may indicate past opportunities to try different care management strategies and their adaptability to new operational processes (a count across the following: bundled or episode-based payments, primary care and support programs, pay-for-performance programs, capitated contracts with commercial health plans, Medicare upside-only risk-bearing contracts, and commercial ACO contracts) and predominant clinical population groups (i.e., adult, pediatric, or both), as this may indicate involvement of different types of clinicians, who have unique practice tendencies.…”