Table 2.

RE-AIM a priori constructs.

Domain	Operational definition	Findings
Reach	The number of patients expected or shown to reap the main benefit from the program	Beyond the scope of this paper
Effectiveness1	How participation in the program improved the attendees' ability to provide quality patient care	Attendees reported gaining multidisciplinary knowledge and increased job satisfaction, improved self-efficacy in communicating with, providing care for, offering resources to patients, reduced opioid prescribing, and referring patients with chronic pain
Adoption	A description of the program attendees, their roles, and how they learned about the SCAN-ECHO program	Attendees were PCPs and support staff in primary care; informed about program from local leaders or from professional conferences
Implementation	How spokes sites implemented SCAN-ECHO at their sites, including barriers and facilitators to participation How hub sites organized the content and format of the SCAN-ECHO program and sessions	Participation in the program was possible when local leadership supported session attendance by allowing schedules to be blocked and offering continued education credit Hub sites implemented programs using different delivery platforms (video and/or audio only) and with different attendance expectations (regular attendance expected or no expectations). Didactic sessions covered a similar range of topics
Maintenance	How participants continue to use knowledge and skills obtained from the SCAN-ECHO program	Attendees continued to learn from program by continued attendance or continued interaction with fellow attendees or program leaders

¹Effectiveness measured at PCP level, not patient outcomes.