Contingency management for smoking cessation among individuals with type 2 diabetes: protocol for a multi-center randomized controlled feasibility trial

Table 1 Detailed data collection schedule and measurement items

		Study period
		Enrollment (-t₁)	Allocation (0)	Post-allocation (t₁-t₁₂)	Close-out (t₁₃)
	Assessment items (#)	Visit 1 (baseline, week 1)	Visit 2 (quit date, week 2)	Daily assessment (week 2 to 13)	Visit 3 (week 13)
Enrollment
Eligibility screen		X
Informed consent		X
Allocation			X
Interventions
Short term incentives (6 weeks)		X	X	X	X
Long term incentives (12 weeks)		X	X	X	X
No incentives (control)		X	X	X	X
Assessments
Biological/anthropometric measures	3	X	X		X
Demographic/background information questionnaire	10	X
Tobacco history questionnaire	17	X
Heaviness of smoking index	2	X
Wisconsin smoking withdrawal scale—craving (past week)	4	X
Self-efficacy scale/confidence	9	X
Motivation to quit	3	X
Diabetes questionnaire	5	X
Diabetes self-management questionnaire	16	X			X
Consideration of future consequences scale	12	X
Daily stress and anxiety	5			X
Daily urges to smoke	4			X
Daily mood and physical symptoms scale	12			X
Daily self-efficacy/confidence/motivation	4			X
Daily tobacco and medication use	7			X
Daily diabetes and health questions	6			X
Daily CO reading (iCO™ Smokerlyzer®)	1			X
Study participation exit questionnaire	10				X

ISSN: 2055-5784