Table 3

Predictors of sustained abstinence and tweet volume

	Relationship to sustained abstinence*†‡			Intervention only, relationship to tweet volume*
	OR	CI	p Value	β	CI	p Value
Age	1.01	0.93 to 1.11	0.776	1.36	−0.76 to 3.47	0.210
Sex: male	1.25	1.03 to 1.52	0.027	−0.50	−41.68 to 40.69	0.981
Education: college degree or higher	0.97	0.83 to 1.13	0.686	14.40	13.69 to 69.11	0.003
Marital status: married/partnered	1.16	0.98 to 1.37	0.092	−24.22	−65.40 to 16.95	0.249
Employment status: employed	0.94	0.84 to 1.05	0.239	−16.86	−59.83 to 26.10	0.442
Cigarettes per day at baseline	1.01	0.99 to 1.02	0.512	2.30	−1.93 to 6.53	0.287
Resolute abstinence goal	1.16	1.06 to 1.27	0.001	−15.27	−61.86 to 31.32	0.521
Intervention participants only
Posted image for Tweet2Quit profile	1.35	0.59 to 3.07	0.478	51.90	5.39 to 98.41	0.029
Tweeted on mobile phone with texting	1.19	0.43 to 3.30	0.737	33.73	18.75 to 48.71	0.001
Tweeted at work	1.12	0.34 to 3.63	0.856	40.06	21.75 to 58.37	0.001
Tweet volume	1.02	1.02 to 1.03	0.001	–	–	–

*Based on multivariate models.
†No interactions with condition (intervention vs control), p>0.289.
‡Sustained abstinence was recorded if a participant responded at 7, 30 and 60 days, and consistently reported not smoking for the prior 7 days.