Table 1.

Overview of the Supportive Text vs Email Messaging (STEM) outcome measures.

RE-AIMa domain and outcomes			Measures		Data source		Timeline (months)
						1-3		4-6		7-9		10-12		13-15		16-18
Reach
	Dose delivered	The frequency of emails and text messages sent to the subscribers (including delivery failures)		STEM metadata		✓		✓		✓		✓		✓		✓
	Dose received	The average number of times participants read the emails or text messages		Survey questionnaire						✓		✓		✓		✓
Effectiveness
	Depression symptom score	Patient Health Questionnaire-9 (PHQ-9)		Clinical questionnaire						✓		✓		✓		✓
	Patients’ quality of life	5-item World Health Organization Well-Being Index (WHO-5)		Clinical questionnaire						✓		✓		✓		✓
	Anxiety symptom scores	Generalized Anxiety Disorder-7 (GAD-7)		Clinical questionnaire						✓		✓		✓		✓
Adoption
	Acceptability/uptake	The number of subscriptions to the text and email services		STEM metadata												✓
	Acceptability/uptake	Barriers and facilitators		Qualitative focus group discussions guided by the CFIRb												✓
Implementation
	Feasibility	Implementation drivers (barriers and facilitators)		Qualitative focus group discussions guided by the CFIR												✓
	Fidelity	The proportion of participants who read the messages at least once a day		Survey questionnaire						✓		✓		✓		✓
	Cost	Comparative cost of developing and maintaining both strategies		STEM metadata		✓		✓		✓		✓		✓		✓
Maintenance
	Sustainability	Dropout rates; barriers and facilitators		Subscription data; qualitative focus group discussions guided by the CFIR												✓

^aRE-AIM: Reach, Effectiveness, Adoption, Implementation, and Maintenance.

^bCFIR: Consolidated Framework for Implementation Research.