Table 2.

Summary of characteristics of included studies (n=39).

Characteristics			Meta-analysis (n=28), n (%)		Non–meta-analysis (n=11), n (%)		Total studies (n=39), n (%)
Intervention
	Web-based	1 (4)		0 (0)		1 (3)
	mHealtha	25 (89)		5 (45)		30 (77)
	Multiplatform	2 (7)		6 (55)		8 (21)
Country
	High-income countries or regions	19 (68)		9 (82)		28 (72)
	Low- and middle-income countries or regions	9 (32)		2 (18)		11 (28)
Delivery
	Personalized or interactive	19 (68)		10 (91)		29 (74)
	Not personalized or interactive	9 (32)		1 (9)		10 (26)
Participants
	Adult smokers only with intention to quit	18 (64)		8 (73)		26 (67)
	Adult smokers with or without intention to quit	0 (0)		1 (9)		1 (3)
	Pregnant smokers	5 (18)		0 (0)		5 (13)
	Smokers with mental disorders	3 (11)		0 (0)		3 (77)
	Other susceptible individuals	2 (7)		2 (18)		4 (10)
eHealth role
	eHealth as primary intervention	23 (82)		11 (100)		34 (87)
	eHealth as adjunct intervention	5 (18)		0 (0)		5 (13)
Theoretical framework
	Cognitive behavioral therapy	1 (4)		2 (18)		3 (8)
	Mindfulness (acceptance and commitment therapy)	4 (14)		2 (18)		6 (15)
	Social cognitive theory	3 (11)		1 (9)		4 (10)
	Multitheories	4 (14)		0 (0)		4 (10)
	Other	6 (21)		2 (18)		8 (21)
	Not stated	10 (36)		4 (36)		14 (36)
Abstinence verification
	Self-reported	10 (36)		7 (64)		17 (44)
	Biochemically verified	18 (64)		4 (36)		22 (56)
Reported outcome other than abstinence (percentage may not add up to 100%)
	Cigarette consumption	10 (36)		4 (36)		14 (36)
	User satisfaction	15 (54)		4 (36)		19 (38)
Longest reported length of follow-up
	3 months	10 (36)		2 (18)		12 (31)
	6 months (including late pregnancy)	14 (50)		5 (45)		19 (49)
	12 months	4 (14)		4 (36)		8 (21)

^amHealth: mobile health.