Table 1.

Summary of the five domains of the RE-AIM framework according to the definition, operationalisation and data source.

Domain	Definition	Operationalisation	Data Source
			Zoom Data Analytics	Participant Questionnaire (n = 1052)	SRAU Administrative Logs
Reach
	Number and representativeness of people willing to engage with a given initiative	•Number of meetings delivered	✓
		•Attendees (number of log-ins)a	✓
		•Average number of attendees per meeting	✓
		•Consistency of deliveryb	✓
		•Characteristics of participants accessing the online groups		✓
Effectiveness
	Impact of an initiative on service user outcomes	•Engagement		✓
		•Experience		✓
		•Contribution to recovery		✓
Adoption
	Number and representativeness of settings and providers willing to deliver an initiative	•Number of services with the capacity to deliver online groups			✓
		•Number of services that delivered online groups during the evaluation period	✓		✓
		•Growth or drop-off of online service provision across the 12-month evaluation periodc	✓		✓
		•Number of facilitators trained			✓
Implementation
	Degree to which an initiative is delivered ‘as intended’	•The degree to which SRAU met a-priori goals regarding:
		-Total number of online groups establishedd	✓		✓
		-Engagement of third-party providers	✓		✓
		-Provision of support to targeted cohorts	✓		✓
Maintenance
	The extent to which an initiative becomes routine within organisational practices and/ or policies	•Ongoing delivery of online groups in the 2-months following the conclusion of the 12-month study period, including:	✓		✓
		-Number of meetings
		-Number of attendees

Note.^aTo account for the facilitator, ‘attendees’ are defined as (total number of participants −1) × the total number of groups; ^bAverage delivery per month per group is derived from the total number of times the each group was delivered, divided by the number of months it was delivered at least once; ^cIn addition to descriptive statistics, the number of volunteers and service providers who delivered online groups at least once within every month of the evaluation was calculated and used as an index of ongoing engagement; ^c Calculated as the number of Unique meeting IDs used to deliver groups (n = 174) minus the number of IDs only used once (n = 42) minus the six existing meetings.