Table 2.

Smoking cessation outcomes by follow-up time point^b

No. (%) or Mean (SD)

Variable	Overall (N = 863)	QuitGuide (n = 416)	iCanQuit (n = 447)	OR (95% CI)	p value
12-months outcomes
30-d PPA	179/757 (24%)	74/370 (20%)	105/387 (27%)	1.46 (1.04, 2.06)	0.030
30-d PPA, missing-as- smoking^c	179/863 (21%)	74/416 (18%)	105/447 (23%)	1.41 (1.01, 1.97)	0.046
30-d PPA, multiple imputation^d	2035/8630 (24%)	823/4160 (27%)	1212/4470 (20%)	1.51 (1.07, 2.14)	0.020
7-d PPA	226/757 (30%)	100/370 (27%)	126/387 (33%)	1.29 (0.94, 1.77)	0.116
Prolonged abstinence^e	60/598 (10%)	25/296 (8%)	35/302 (12%)	1.43 (0.83, 2.45)	0.199
30-d PPA of all tobacco products^f	157/758 (21%)	60/371 (16%)	97/387 (25%)	1.71 (1.19, 2.46)	0.004

6-months outcomes

30-d PPA	153/778 (20%)	51/376 (14%)	102/402 (25%) 139/402 (35%)	2.15 (1.48, 3.12)	<0.001
7-d PPA	229/778 (29%)	90/376 (24%)	139/402 (35%)	1.69 (1.23, 2.32)	0.001

3-months outcomes

30-d PPA	107/752 (14%)	40/362 (11%)	67/390 (17%)	1.67 (1.10, 2.56)	0.017
7-d PPA	176/752 (23%)	63/362 (17%)	113/390 (29%)	1.96 (1.38, 2.78)	<0.001

Abbreviations: OR, odds ratio; PPA, point prevalence abstinence

All models include the following covariates: education (high school diploma or less), heavy smoking (>20 cigs/day), minority race or ethnicity and depression symptoms (CESD-2016).

All outcomes are complete case (i.e., exclusion of participants lost to follow-up) was specified a priori as the primary outcome, except where noted.

Itent-to-treat missing-as-smoking analysis was specified a priori as a secondary outcome.

Multiple imputation sensitivity analysis was used to estimate missing 30-day PPA at 12-months. Effect sizes and standard errors from ten imputed datasets were pooled using Rubin‟s rules⁵¹ to generate a single OR and 95% confidence interval.

Defined as no smoking since 3-months post-randomization, using self-reported data of last cigarette.

Including any kind of e-cigarettes or vaping, chewing tobacco, snus, hookahs, cigars, cigarillos, tobacco pipes, and kreteks.