Adaptive interventions to optimise the mobile phone-based smoking cessation support: study protocol for a sequential, multiple assignment, randomised trial (SMART)

Table 1 Adaptive intervention strategies embedded

	Adaptive intervention strategy			Type of strategy	Subgroup
	Phase 1 intervention	Tailoring variable assessed at 1 month (7-day PPA)	Phase 2 intervention	Type of strategy	Subgroup
1	PIM	Smoking	PIM+OCI	Adapt	A
2	PIM	Smoking	PIM	Maintain	B
3	PIM	Quitting	PIM	Maintain	C
4	RIM	Smoking	PIM	Adapt	D
5	RIM	Smoking	RIM	Maintain	E
6	RIM	Quitting	RIM	Maintain	F

Abbreviations: PIM, personalised instant messaging; OCI, optional combined intervention; RIM, regular instant messaging. Phase 1 intervention will be conducted during the first month after enrolment and phase 2 intervention will be conducted during the second and third months after enrolment

ISSN: 1745-6215