Table 2.

Summary of outcomes and measures used in the Get Healthy, Stay Healthy trial

Primary outcomes	GHS-comparable tools	Additional tools
Moderate-vigorous physical activity (MVPA)	● 3-item physical activity assessment tool [51] capturing walking, moderate and vigorous activity (via CATI)	● Accelerometer (Actigraph GT1M, 10s epoch) capturing duration and frequency of MVPA
Dietary behaviours	● Two stand-alone items [56] on servings of fruit and vegetables per day (via CATI)	● Fat & Fibre Behaviour Questionnaire [58] via CATI (Total Index (1 to 5))
Body weight and waist circumference	● Self-reported (via CATI)
Secondary outcomes	GHSH-specific tools
Feasibility indicators	● Number and type of text messages sent
	● Number and duration of tailoring interviews completed
	● Number of prompted and unprompted text message replies from participants
Acceptability indicators	● Recall of number of text messages received
	● Treatment of text messages on receipt
	● Categorical satisfaction ratings
	● Qualitative feedback on intervention
Mediators	● Outcome expectancy: MVPA [60]; diet [64]
	● Satisfaction with perceived outcomes: MVPA and diet [59]
	● Self-regulation: MVPA and diet [65]
	● Self-efficacy: MVPA [66]; diet [67]
	● Social support: MVPA and diet [68]
	● Perceived environmental opportunity: MVPA [69]; diet [72,73]
Moderators	● Demographics (e.g. age, education)
	● Health status (e.g. chronic diseases, need for medical clearance before commencing GHS)
	● Behavioural and anthropometric changes during initial GHS