Table 2.

Primary and secondary study outcomes.

		QuitGuide (N=30)a	Quit2Heal (N=29)a	P valueb
Utilization
	Logged in at least once, % (n/N)	97 (29/30)	93 (27/29)	.43
	Number of times the app was openedc,d, Mean (SD)	6.1 (5.3)e	10.0 (14.4)f	.33
	Time spent per log in (in min)	2.7 (2.1)e	3.9 (3.2)e	.07
	Number of days from the first use to the last usec, Mean (SD)	19.8 (22.6)e	25.1 (19.8)f	.32
Participant acceptability, % (n/N)
	Satisfied overallg	65 (17/26)	90 (19/21)	.047
	Will recommend to a friend	57 (16/28)	74 (17/23)	.21
	App was made for someone like to meg	62 (16/26)	86 (18/21)	.04
Smoking outcomes at 2 months, % (n/N)
	30-day quit rate, using all available outcome datad	7 (2/29)	20 (5/25)	.10
	30-day quit rate, missing outcomes coded as smokingd	7 (2/30)	17 (5/29)	.17
Process indicatorsh, Mean (SD)
	Change in internalized shame	0.2 (3.5)i	−0.5 (4.7)j	.27
	Change in cancer-related stigma	−1.3 (8.8)i	−3.0 (9.9)k	.48
	Change in depression score	−0.9 (6.5)l	−3.5 (5.0)k	.38
	Change in anxiety score	0.0 (5.6)m	−2.8 (6.8)j	.56

^aSample size, unless otherwise indicated in the cell.

^bTwo-sided P values were calculated from regression models adjusted for 3 factors used in stratified randomization: Heaviness of Smoking Index >4, confidence of being smoke-free >70, and recruitment method (clinical vs nonclinical). Unadjusted 2-sided P values were very similar.

^cApp opening data are limited to a subset of participants for whom the objective utilization data were available. Owing to a technical error, automatic recording of the utilization data began 2 months after the beginning of the trial recruitment period.

^dRegression model was adjusted for high school or less education because of its association with the outcome and slight imbalance between arms.

^eN=15.

^fN=17.

^gResponses were dichotomized as “somewhat,” “mostly,” or “very much” versus “not at all” or “a little.”

^hProcess indicators were calculated as follow-up score minus baseline score.

ⁱN=29.

^jN=25.

^kN=24.

^lN=27.

^mN=28.