Table 1:

Key Characteristics by Parent Trial

	BASC	MOVE IT
Parent trial participants	Daily smokers with current or lifetime major depressive disorder.	Adults admitted for inpatient care on general medicine or oncology units.
Parent trial intervention	Two behavioral interventions in combination with varenicline	Supportive social incentive-based gamification intervention in the three months post-hospital discharge. Hospital-implemented mobility protocol using wearable technology.
Parent trial outcome(s)	Point-prevalence abstinence post- target quit date.	Change in mean daily step count.
Is there a separate step to screen for RETAIN-specific eligibility?	Yes Patients are probed for prior knowledge of incentive randomization, equalization, or the maximum amount offered under RETAIN.	No
Do patients actively consent to RETAIN ?	No A waiver of consent for RETAIN has been approved by the IRB.	No A waiver of consent for RETAIN has been approved by the IRB.
Can anyone enroll in the parent trial without enrolling in RETAIN?	Yes, if they screen ineligible specifically for RETAIN	No
Incentive for parent trial subjects not enrolled in RETAIN	Up to $200	Not applicable
Incentive levels	None: $0 Moderate: $200 High: $500	None: $0 Moderate: $100 High: $300
Debriefing Plan	On the phone, before the first day of the assigned intervention for the parent trial.	In-person, during the same encounter as all RETAIN procedures and prior to beginning the assigned intervention for the parent trial.
Payments to subjects consented to RETAIN and the parent trial	$300 in two $150 installments, plus up to $200 from individual session/travel payments.1	$300 in two $150 installments